iommu: msm: Add PMU support for msm8610

Add Performance Monitor Unit (PMU) support for msm8610 IOMMU. The PMU
allows you to measure the performance of the IOMMU such as TLB miss
rate. The PMU for msm8610 can be configured to monitor the following
events:

-TLB Refill
-TLB Refill - Read
-Access
-Access - Write
-Number of Full Misses

Change-Id: I786c2a283eb52325b3bacc864f4bb03dd6ebc946
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>
9 files changed