ARMv8 doesn't imply Aarch64, so correct a check that was making that
assumption. This fixes the build on 32-bit ARMv8 targets such as
Cortex-A32.
(From OE-Core rev: 78ae8b02bfbf0d98ae481682179439845d30c797)
Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>