kselftest/arm64: Add coverage of SME 2 and 2.1 hwcaps

Add the hwcaps defined by SME 2 and 2.1 to the hwcaps test.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20221208-arm64-sme2-v4-21-f2fa0aef982f@kernel.org


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