arm64/sysreg: Fix typo in SCTR_EL1.SPINTMASK

SPINTMASK was typoed as SPINMASK, fix it.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20221005181642.711734-1-broonie@kernel.org


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