msm_fb: Handle vsync interrupt properly on MDP 3.03 targets

Handle enabling/disabling the vsync interrupt and mdp clock
enabling/disabling in a better way on MDP 3.03 targets. This
will avoid target crashes due to unclocked register access.

CRs-fixed: 388751
Change-Id: I5c4a409772464ce7d06869374dcba5ad7e335955
Signed-off-by: Padmanabhan Komanduru <pkomandu@codeaurora.org>

Conflicts:

	drivers/video/msm/mdp.c
	drivers/video/msm/mdp.h
	drivers/video/msm/mdp_dma.c
	drivers/video/msm/mdp_dma_dsi_video.c
	drivers/video/msm/mdp_dma_lcdc.c
what?

Change-Id: Ic1913a1fe4550e7de9e664f3382684cedf991b50