selftests/arm64: add HWCAP2_LRCPC3 test

Add a test for the newly added HWCAP2_LRCPC3.

Signed-off-by: Joey Gouly <joey.gouly@arm.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20230919162757.2707023-3-joey.gouly@arm.com


Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>