[llvm] [llvm][llvm-readobj] Add NT_ARM_GCS Linux core note type (PR #117545)

[Omair Javaid via llvm-commits]

https://github.com/omjavaid approved this pull request.

For reference NT_ARM_GCS is defined at: 
https://github.com/torvalds/linux/blob/master/include/uapi/linux/elf.h
#define NT_ARM_GCS	0x410		/* ARM GCS state */


https://github.com/llvm/llvm-project/pull/117545