ANDROID: fix up arm64 eratta addition

In commit 93696d8f ("arm64: errata: Add workaround for Arm errata
3194386 and 3312417"), a new cpucaps was added, which changes the crc
for the system_cpucaps variable which breaks the kernel abi.  Fix this
up by using a reserved slot in the cpucaps list, as designed.

Fixes: 93696d8f ("arm64: errata: Add workaround for Arm errata 3194386 and 3312417")
Change-Id: Iff68a7223e6cf08d3b87fa53af6bbd09437c7af5
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>