Fix Framebuffer console Oops

See http://ix.io/8Wl/ (lines 51-191)

This was caused by a race condition where mdp4_dsi_video_pipe_queue may be called before
mdp4_dsi_vsync_init. This can be caused from a request to msm_fb_pan_idle in the msm_fb module
(ex: from fbmem) before the mdp module and console have finish initializing.

It might be possible for a better solution, but this does successfully fix the Oops.
There are still some arfifacts when refreshing the screen (dmesg scrolling or ncurses menus),
so any additional testing and suggestions/patches would be very welcome :)

PS2: Fix whitespace in commit message

Change-Id: I9bd6f5b9cea035fbcb2775ffba2a827eca43f790