Added LLVM-specific configuration variables to ARM architecture CMake files:
- LLVM_ARCHTYPE for architecture variant (thumbv6m, thumbv7a, etc)
- LLVM_CPUTYPE for CPU target (cortex-m0, cortex-a5, etc)
- LLVM_ABITYPE for ABI (eabi/eabihf)
These changes enable LLVM/Clang toolchain support while maintaining
compatibility with existing GCC configurations. The LLVM variables
are set based on the same architecture/CPU/FPU configurations used
for GCC flags.
Signed-off-by: Huang Qi <huangqi3@xiaomi.com>
6dbdfb3cd5