Re-enable clippy checks

[tomusdrw]

Currently clippy fails to compile some of Substrate dependencies with:

error: cannot find macro `asm` in this scope
  --> /home/builds/.cargo/registry/src/git.luolix.top-1ecc6299db9ec823/rsix-0.23.9/src/imp/linux_raw/arch/inline/x86_64.rs:57:5
   |
57 |     asm!(
   |     ^^^
   |
   = note: consider importing one of these items:
           std::arch::asm
           core::arch::asm

error: cannot find macro `asm` in this scope
  --> /home/builds/.cargo/registry/src/git.luolix.top-1ecc6299db9ec823/rsix-0.23.9/src/imp/linux_raw/arch/inline/x86_64.rs:12:5
   |
12 |     asm!(
   |     ^^^
   |
   = note: consider importing one of these items:
           std::arch::asm
           core::arch::asm

error: cannot find macro `asm` in this scope
  --> /home/builds/.cargo/registry/src/git.luolix.top-1ecc6299db9ec823/rsix-0.23.9/src/imp/linux_raw/arch/inline/x86_64.rs:26:5
   |
26 |     asm!(
   |     ^^^
   |
   = note: consider importing one of these items:
           std::arch::asm
           core::arch::asm

error: cannot find macro `asm` in this scope
  --> /home/builds/.cargo/registry/src/git.luolix.top-1ecc6299db9ec823/rsix-0.23.9/src/imp/linux_raw/arch/inline/x86_64.rs:44:5
   |
44 |     asm!(
   |     ^^^
   |
   = note: consider importing one of these items:
           std::arch::asm
           core::arch::asm

error: cannot find macro `asm` in this scope
  --> /home/builds/.cargo/registry/src/git.luolix.top-1ecc6299db9ec823/rsix-0.23.9/src/imp/linux_raw/arch/inline/x86_64.rs:73:5
   |
73 |     asm!(
   |     ^^^
   |
   = note: consider importing one of these items:
           std::arch::asm
           core::arch::asm

error: cannot find macro `asm` in this scope
  --> /home/builds/.cargo/registry/src/git.luolix.top-1ecc6299db9ec823/rsix-0.23.9/src/imp/linux_raw/arch/inline/x86_64.rs:93:5
   |
93 |     asm!(
   |     ^^^
   |
   = note: consider importing one of these items:
           std::arch::asm
           core::arch::asm

error: cannot find macro `asm` in this scope
   --> /home/builds/.cargo/registry/src/git.luolix.top-1ecc6299db9ec823/rsix-0.23.9/src/imp/linux_raw/arch/inline/x86_64.rs:114:5
    |
114 |     asm!(
    |     ^^^
    |
    = note: consider importing one of these items:
            std::arch::asm
            core::arch::asm

error: cannot find macro `asm` in this scope
   --> /home/builds/.cargo/registry/src/git.luolix.top-1ecc6299db9ec823/rsix-0.23.9/src/imp/linux_raw/arch/inline/x86_64.rs:136:5
    |
136 |     asm!(
    |     ^^^
    |
    = note: consider importing one of these items:
            std::arch::asm
            core::arch::asm

error: cannot find macro `asm` in this scope
   --> /home/builds/.cargo/registry/src/git.luolix.top-1ecc6299db9ec823/rsix-0.23.9/src/imp/linux_raw/arch/inline/x86_64.rs:159:5
    |
159 |     asm!(
    |     ^^^
    |
    = note: consider importing one of these items:
            std::arch::asm
            core::arch::asm

error: cannot find macro `asm` in this scope
   --> /home/builds/.cargo/registry/src/git.luolix.top-1ecc6299db9ec823/rsix-0.23.9/src/imp/linux_raw/arch/inline/x86_64.rs:183:5
    |
183 |     asm!(
    |     ^^^
    |
    = note: consider importing one of these items:
            std::arch::asm
            core::arch::asm

error: cannot find macro `asm` in this scope
   --> /home/builds/.cargo/registry/src/git.luolix.top-1ecc6299db9ec823/rsix-0.23.9/src/imp/linux_raw/arch/inline/x86_64.rs:208:5
    |
208 |     asm!(
    |     ^^^
    |
    = note: consider importing one of these items:
            std::arch::asm
            core::arch::asm

error: cannot find macro `asm` in this scope
   --> /home/builds/.cargo/registry/src/git.luolix.top-1ecc6299db9ec823/rsix-0.23.9/src/imp/linux_raw/arch/inline/x86_64.rs:234:5
    |
234 |     asm!(
    |     ^^^
    |
    = note: consider importing one of these items:
            std::arch::asm
            core::arch::asm

error: cannot find macro `asm` in this scope
   --> /home/builds/.cargo/registry/src/git.luolix.top-1ecc6299db9ec823/rsix-0.23.9/src/imp/linux_raw/arch/inline/x86_64.rs:261:5
    |
261 |     asm!(
    |     ^^^
    |
    = note: consider importing one of these items:
            std::arch::asm
            core::arch::asm

error: cannot find macro `asm` in this scope
   --> /home/builds/.cargo/registry/src/git.luolix.top-1ecc6299db9ec823/rsix-0.23.9/src/imp/linux_raw/arch/inline/x86_64.rs:289:5
    |
289 |     asm!(
    |     ^^^
    |
    = note: consider importing one of these items:
            std::arch::asm
            core::arch::asm

    Checking webpki-roots v0.21.0

The check was disabled in #388 and the issue is about adding clippy back to the build/check pipeline.