msm_fb: display: add pipe commit ioctl

currently, pan display serves as pipe commit. However it
may spend long time pending on cosole_lock() which cause
flickering on HDMI. Add pipe commit ioctl to allow commit
from overlay in addition to pan_display.

CRs-fixed: 391564
Change-Id: I163b5d96f727b70b4d5693e9a414b59339818998
Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
(cherry picked from commit a77eca6cee55531e81e21d83b474563f9c143e77)

Signed-off-by: Dhivya Subramanian <dthiru@codeaurora.org>

Conflicts:

	drivers/video/msm/mdp4_overlay_dsi_cmd.c
	drivers/video/msm/mdp4_overlay_dsi_video.c
	drivers/video/msm/mdp4_overlay_dtv.c
	drivers/video/msm/mdp4_overlay_lcdc.c