msm_fb: Add support for Vsync driven composition on MDP 3.03 targets

Add support for vsync notification to user space using user events.
This is to trigger frame composition based on Vsync.

Change-Id: Ifdfef0d0e2ec9d6ca3e916398b9f17ccfbf7aeba
Signed-off-by: Jeevan Shriram <jshriram@codeaurora.org>

Conflicts:
	drivers/video/msm/mdp_dma.c