msm: tsc: Enable VBIF clocks

TSC requires the VBIF AHB and AXI clocks to be enabled when
working with the VBIF (used for buffer mode transactions in the
tsc_ci). They should be enabled before attaching IOMMU context
and disabled after detaching IOMMU context.

Change-Id: I29d25b4a45975c71d8d47557ce7fbb701794033b
Signed-off-by: Anat Etzion-Fuchs <aetzion@codeaurora.org>