Revert "arm64: smccc: Remove broken support for SMCCCv1.3 SVE discard hint"

This reverts commit 522328e8 which is
commit 8c462d56 upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: Ie2cc19307ce437fa83ed4f1fa15cfc498c1c3454
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>