msm: mdss: Add commit handler to writeback display
msm: mdss: Add commit handler to writeback display

Add support for a "vsync handler" for writeback displays to be able to
schedule tasks to be run as soon as the frame has completed.

Change-Id: I8c6945a6e914e307de67b2ec6df25f4509a50da7
Signed-off-by: Carl Vanderlip <c1ee614365181d9b29d91b6c5237384ed28bec62@codeaurora.org>
Signed-off-by: Ping Li <915655ad01061a8ee4f5aedf64e4a81e454408f3@codeaurora.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas