arm64: Fix usage of new shifted MDCR_EL2 values

arm64: Fix usage of new shifted MDCR_EL2 values

Since the linked fixes commit, these masks are already shifted so remove
the shifts. One issue that this fixes is SPE and TRBE not being
available anymore:

 arm_spe_pmu arm,spe-v1: profiling buffer owned by higher exception level

Fixes: 641630313e9c ("arm64: sysreg: Migrate MDCR_EL2 definition to table")
Signed-off-by: James Clark <james.clark@linaro.org>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20241122164636.2944180-1-james.clark@linaro.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>