iommu: arm-smmu: domain power on arm_smmu_map/map_sg

Enable domain power in arm_smmu_map/map_sg. This is not required with QGKI
kernel due to downstream fixes. So limit the domain power enable only for
QGKI build.
Add config ARM_SMMU_SKIP_MAP_POWER_ON to limit this for specific targets.

Change-Id: I299666da1b812fc3dd06960e75ddd1fb08e9a8d0
Signed-off-by: Prakash Gupta <guptap@codeaurora.org>