Revert "conditionally use IOMMU only for caf display variant"

This reverts commit 958ec67fc485c8183331163ba9bff3f7b6f4f813.

Conflicts:
	mm-video/vidc/vdec/Android.mk
	mm-video/vidc/vdec/src/omx_vdec.cpp
media: fix mismerge
media: don't build if legacy display variant