kselftest/arm64: Remove local ARRAY_SIZE() definitions

An ARRAY_SIZE() has been added to kselftest.h so remove the local versions
in some of the arm64 selftests.

Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Shuah Khan <skhan@linuxfoundation.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20220124171748.2195875-1-broonie@kernel.org


Signed-off-by: Will Deacon <will@kernel.org>