Revert "spm: Build with FP registers save/restore support"

This reverts commit 8eda3569b2fc2cd17f41de0f90a99af99587997d.
SIMD context is now saved in S-EL2 as opposed to EL3, see commit:
https://review.trustedfirmware.org/c/hafnium/hafnium/+/8321

Signed-off-by: Max Shvetsov <maksims.svecovs@arm.com>
Change-Id: Ib28f8a637e8134c6af61eec838923b951197c01f
6 files changed