msm: mdp: vsync waitqueue for lcdc and dtv interfaces

This is a follow up commit to "msm: mdp: Use a waitqueue for
vsync notification". DTV and LCDC changes were not made on the
earlier commit.

Change-Id: Ibc6c3d62b423facf323335530c721398d03446c2
Signed-off-by: Naseer Ahmed <naseer@codeaurora.org>