boot/efi/arm64: Enable FP/SIMD

* Kernel code uses q0 registers belonging to the 128 bits vectorial & floating point registers
* Apply stylistic suggestion from previous review

Change-Id: I41b5a807c3867de4bb3b9450607d48098f9471ef
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4925
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

boot: ARM64 EFI port

* MMU mapping
* EL2 to EL1 transition (FreeBSD/Jaroslaw Pelczar)
* Initial implementation for cache cleaning and TLB invalidations (ARM)
* Processor Helper functions
* Additional Logging in boot process

Change-Id: Idcee93583418a3c3528c5d9586d3add487f9d5ca
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4888
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>