[clang] [llvm] [RISCV] Add more extensions to spacemit-x100 (PR #186351)

[Mark Zhuang via cfe-commits]

zqb-all wrote:

https://github.com/llvm/llvm-project/pull/174052 discusses whether to list the `S*` extensions. The spacemit-a100 has been listed.

https://github.com/llvm/llvm-project/pull/186351