[llvm] [ARM][AArch64] Enable FEAT_FHM for Arm Neoverse N2 (PR #82613)

[Jonathan Thackray via llvm-commits]

jthackray wrote:

> Please double check if the arch features should listed in sorted alphabetical order. If so, please put FHM and fp16fml in their correct places.

Sure, now ordered when in a sorted list (the lists in TargetParserTest.cpp are not already sorted).

https://github.com/llvm/llvm-project/pull/82613