[clang] [Driver] Don't alias -mstrict-align to -mno-unaligned-access (PR #85350)

[Wang Pengcheng via cfe-commits]

https://github.com/wangpc-pp approved this pull request.

LGTM. cc @asb @topperc 
Some context of RISCV target: https://github.com/riscv-non-isa/riscv-c-api-doc/pull/62

https://github.com/llvm/llvm-project/pull/85350