msm: idle-v7: SMP and AMP mode programming for 8x25 target

Program the Auxiliary Control Regiater(ACTLR.SMP) to switch
from Symmetric MultiProcessing Mode(SMP) to Asymmetric Multi
Processing Mode(AMP) while entering into the GDFS power mode.
This enables the CPU to be taken out of coherency by preventing
the CPU from receiving cache and TLB maintenance operations
broadcast by other CPUs in the system.

Change-Id: I74285e445e86cdb78a85705347550c762e47a0e2
Signed-off-by: Murali Nalajala <mnalajal@codeaurora.org>