ASoC: msm: Make audio IOMMU driver depend on Q6 status

For systems using Q6 SMMU, it is important that clients attach
to IOMMU groups only after Q6 is brought out of reset by PIL.
This is to make sure that clocks for Q6 SMMU are turned ON before
SMMU driver configures the SMMU hardware in Q6. No client should
use ION buffers before attach happens for IOMMU groups.

Change-Id: I5652a0d00e48abf13e20c6173cba6028fd3343c0
Signed-off-by: Banajit Goswami <bgoswami@codeaurora.org>