Introduces instructions for the faminmax extension for AArch64. They are 
documented in the following links:
* famax SIMD: 
https://developer.arm.com/documentation/ddi0602/2023-12/SIMD-FP-Instructions/FAMAX--Floating-point-absolute-maximum-?lang=en
* famax SVE2: 
https://developer.arm.com/documentation/ddi0602/2023-12/SVE-Instructions/FAMAX--Floating-point-absolute-maximum--predicated--?lang=en
* famax SME2: 
https://developer.arm.com/documentation/ddi0602/2023-12/SME-Instructions/FAMAX--Multi-vector-floating-point-absolute-maximum-?lang=en
* famin SIMD: 
https://developer.arm.com/documentation/ddi0602/2023-12/SIMD-FP-Instructions/FAMIN--Floating-point-absolute-minimum-?lang=en
* famin SVE2: 
https://developer.arm.com/documentation/ddi0602/2023-12/SVE-Instructions/FAMIN--Floating-point-absolute-minimum--predicated--?lang=en
* famin SME2: 
https://developer.arm.com/documentation/ddi0602/2023-12/SME-Instructions/FAMIN--Multi-vector-floating-point-absolute-minimum-?lang=en
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Hi,

Regression tested for aarch64-none-elf and found no regressions.

Ok for binutils-master? I don't have commit access so can someone please 
commit on my behalf?

Regards,
Saurabh