iommu: msm: Apply register offset with proper base address

Now we are dumping both global space registers and context
bank registers as a part of page fault handler. Pass
proper base addresses for both of them.

Change-Id: I4d5cbdc508100cbcb5f5960a209d01cadac3904b
Signed-off-by: Chintan Pandya <cpandya@codeaurora.org>