Revert "spmd: ensure SIMD context is saved/restored on SPMC entry/exit"

This reverts commit bedb13f509ac68adaf9baa9b5f24eede912e801d.
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: Ic81416464ffada1a6348d0abdcf3adc7c1879e61
1 file changed