QEMU: Rebase ARC support on top of v5.0

[abrodkin]

We still don't have our repo open so submit this huge patch bomb here.

This is pretty much the same ARC code rebased and fixed to work on top of upstream v5.0 release.

Note I didn't try to run it as there're tons of libs dependencies and it requires entire SDK to be installed while even zephyr-qemu failed to be packaged with the following message:

...
  /usr/bin/qemu-edid
  /usr/bin/qemu-pr-helper
  /usr/bin/qemu-system-xilinx-aarch64
  /usr/libexec/qemu-bridge-helper
Please set FILES such that these items are packaged. Alternatively if they are unneeded, avoid installing them or delete them within do_install.
zephyr-qemu: 164 installed and not shipped files. [installed-vs-shipped]
ERROR: zephyr-qemu-git-r0 do_package: Fatal QA errors found, failing task.
ERROR: zephyr-qemu-git-r0 do_package: Function failed: do_package

[stephanosio]

Thanks, I will also import these patches into stephanosio/zephyr-qemu#14.