[clang] [llvm] [AArch64] Change feature dependencies of fp8 features (PR #122280)

[Carlos Seo via llvm-commits]

ceseo wrote:

This is breaking the AArch64 2-stage buildbot: https://lab.llvm.org/buildbot/#/builders/84/builds/1005

https://github.com/llvm/llvm-project/pull/122280