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This reverts commit bedb13f5.
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