arm64/hwcap: Remove stray references to SF8MMx

Due to SME currently being disabled when removing the SF8MMx support it
wasn't noticed that there were some stray references in the hwcap table,
delete them.

Fixes: 81993546 ("arm64/hwcap: Describe 2024 dpISA extensions to userspace")
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20250203-arm64-remove-sf8mmx-v1-1-6f1da3dbff82@kernel.org


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