ANDROID: fix up abi break in arm64 cpu_hwcaps

In commit 286c8ca9 ("arm64: errata: Add workaround for Arm errata
3194386 and 3312417"), we add a new cpucap type, but as that breaks the
existing kernel ABI for Android systems, we need to properly use one of
the reserved slots for it instead of adding a new one.

Fixes: 286c8ca9 ("arm64: errata: Add workaround for Arm errata 3194386 and 3312417")
Change-Id: I7bbb7ffcc59cbfa9a1f03f7081df3387b8151a86
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>