ANDROID: GKI: remove CONFIG_CRYPTO_SHA512_ARM64_CE from gki_defconfig

In commit 60e3f1e9 ("lib/crypto: arm64/sha512: Migrate optimized
SHA-512 code to library"), the sha512 code was moved to a library, and
the Kconfig option was removed as it's not needed anymore.  Remove it
from the gki_defconfig arm64 file so that it will continue to build
properly.

Fixes: 60e3f1e9 ("lib/crypto: arm64/sha512: Migrate optimized SHA-512 code to library")
Change-Id: Ifcb02608b21c8f400474f11d652789389a05cf0e
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>