msm_fb: display: Consolidate commit ioctls

Overlay commit and display commit were two separate
ioctls doing similar things. This change consolidates
the two into one display commit ioctl. With this, we
can use the RGB0 pipe with an IOMMU framebuffer.

Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
Signed-off-by: Naseer Ahmed <naseer@codeaurora.org>

Conflicts:
	drivers/video/msm/msm_fb.c
	include/linux/msm_mdp.h

Change-Id: Id8e5702aa8277be0fa33e2e4ec06f501147aaeb0
Define MDSS_MDP_ROT_ONLY

Change-Id: I3ccfefbae1f667607f5b4435cef4144ef14e3c10