msm: mdss: reduce waiting time before turn off mdp clock

Vsync happens at every 16.6 ms. Currently it waits for
6 vsyncs (100 ms) time before turning off mdp clock if
there is no new frame update. During suspend procedure,
change it to 1 so that mdp clock is turned off 1 vsync
after kickoff has completed if there is kickoff pending.
Otherwise mdp clock is turned off at next vsync.

Change-Id: Ibb000b04cb4204ff63647dda3146c55084330687
Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>