msm: iommu: Split rotator/mdp iommu domains

Finer granularity is needed when mapping into the IOMMU's for
rotator and mdp for secure playback. During secure playback
HLOS will only have access to map into one context bank. The
other context bank is secured and programmed by TrustZone.

Divide DISPLAY_DOMAIN into DISPLAY_WRITE_DOMAIN and
DISPLAY_READ_DOMAIN. Divide ROTATOR_DOMAIN into ROTATOR_SRC_DOMAIN
and ROTATOR_DST_DOMAIN.

Change-Id: If3e556171645e8ea02deb12ca543df36233db5f2
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>