drm: msm: update vsync source for sde rsc

SDE rsc hw should select "1" for INTF_0,
"2" for INTF_1, etc. for vsync source. This patch
updates the vsync source from client based
on its intf index. It also updates the
bandwidth increase/decrease indication for
video mode display.

Change-Id: Ieef9f90ff8b43d51fac4564be9d9b8ce62d742f8
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>