Platform: Unify MPU limit region alignments

-Use limit as described in Arm ARM, i.e. part of the region, maximum
-Remove -1 operation on limit addresses from mpu driver
-Add limit address check focusing on bits [4:0] before configuring MPU,
making sure alignments are done
-Fix MMIO region limits to accommodate above changes
-Align TF-M partition metadata region

Signed-off-by: Gabor Toth <gabor.toth@arm.com>
Change-Id: I68fb97106c625528f190315cfce4c6a092517a48
22 files changed