rk3576: use boot.scr instead of extlinux

[amazingfate]

Description

RK3576 is using different boot script addresses: https://github.com/ArmSoM/u-boot/blob/rk3576-6.1-rk3.1/include/configs/rk3576_common.h#L68-L73
And the default load_addr of rk35xx 0x9000000 does not work. So I creat new boot.cmd for rk3576 with load_addr 0x48000000.
And also add necessary u-boot patches for compile and source command.
UFS driver will cause a fatal error when using boot.scr without UFS on board, so I disable UFS driver in uboot defconfig because there is no board with UFS on it.

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also note any relevant details for your test configuration.

• ./compile.sh BOARD=armsom-sige5 BRANCH=vendor BUILD_MINIMAL=no DEB_COMPRESS=xz KERNEL_CONFIGURE=no RELEASE=noble KERNEL_GIT=shallow BUILD_DESKTOP=no
• ArmSoM Sige5 boots, and overlay added by command armbian-add-overlay works.

Checklist:

Please delete options that are not relevant.

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules