chao an 86e3bd9d75 arm/toolchain: update toolchain comment to avoid confusion
1. add 'ARM' prefix to choice menu
2. rename 'Generic Clang toolchain' to 'LLVM Clang toolchain'
   to avoid confuse with CONFIG_ARM_TOOLCHAIN_ARMCLANG

Signed-off-by: chao an <anchao@xiaomi.com>
2022-10-25 12:33:46 +08:00
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