[llvm] [AArch64] set AppleA14 architecture version to v8.5-a (PR #92600)

[via llvm-commits]

AtariDreams wrote:

@tmatheson-arm can you verify that the information in the guide matches what information is here regarding the chipset?

https://developer.apple.com/file/?file=applesiliconcpuoptimizationguide&agree=true

https://github.com/llvm/llvm-project/pull/92600