msm: mdp: Update sync pt. behaviour

Add a retire fence and clean up the existing release fence
implementation

Signed-off-by: Naseer Ahmed <naseer@codeaurora.org>
Change-Id: Iecf7e95d0786ac43aa6a12d70442936600c0249a
Signed-off-by: helicopter88 <johnlemon.lol@gmail.com>

Conflicts:
	drivers/video/msm/msm_fb.c