msm: display: sync point clean up

Remove unused fence input in mdp_display_commit
structure
Use different timeline name for different fb

Change-Id: I4edd335b36dce057ff3e54302af6088a9cc470ec
Signed-off-by: Ken Zhang <kenz@codeaurora.org>

Conflicts:
	drivers/video/msm/msm_fb.c
	drivers/video/msm/msm_fb.h