iommu: arm-smmu: remove actlr CB scan

ACTLR regiter read scan for all CBs are not required. Avoid this.

Change-Id: Icd3bfe66a7251bea1827b138bfc68284fb7b5b4c
Fixes: 07cff1d2 ("iommu: arm-smmu: Add PM support for actlr register")
Signed-off-by: Prakash Gupta <guptap@codeaurora.org>