arm64/sme: Drop SYS_ from SMIDR_EL1 defines

We currently have a non-standard SYS_ prefix in the constants generated
for SMIDR_EL1 bitfields. Drop this in preparation for automatic register
definition generation, no functional change.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220510161208.631259-4-broonie@kernel.org


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