U-Boot Architectures

* cross-arm-none-eabi-gcc-[0-9]*:../../cross/arm-none-eabi-gcc
* cross-aarch64-none-elf-gcc-[0-9]*:../../cross/aarch64-none-elf-gcc
* cross-riscv64-none-elf-gcc-[0-9]*:../../cross/riscv64-none-elf-gcc
* cross-mipsel-none-elf-gcc-[0-9]*:../../cross/mipsel-none-elf-gcc
* cross-powerpc-none-elf-gcc-[0-9]*:../../cross/powerpc-none-elf-gcc

