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.

Signed-off-by: Padmanabhan Komanduru <pkomandu@codeaurora.org>
Signed-off-by: Jeevan Shriram <jshriram@codeaurora.org>
(cherry picked from commit f3b0c231a85ceef488440ab02fba9b15e468faa0)

Change-Id: I6b30dec851567946136d5cc5e013e247593d18ca
Signed-off-by: Gopal G Goberu <ggober@codeaurora.org>