ANDROID: fix up ABI breakage due to new arm64 errata

In commit cc627930 ("arm64: errata: Add workaround for Arm errata
3194386 and 3312417"), the abi is broken for the number of cpucaps, so
use a reserved space to fix things up properly.

Fixes: cc627930 ("arm64: errata: Add workaround for Arm errata 3194386 and 3312417")
Bug: 161946584
Change-Id: If547259d6f9994b1578d5611d281005014971b7b
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>