ARM: msm: Update MPIDR mask for ARMV8-32bit support

In ARMv8, MPIDR bit[0:23] are all used for multi-clusters support,
so update the MPIDR mask accordingly.

Change-Id: Iae5a2308e7c854a5e85746dffbce7715cf86d86b
Signed-off-by: Xiaocheng Li <lix@codeaurora.org>
Signed-off-by: Srinivas Ramana <sramana@codeaurora.org>