msm: mdss: avoid clock off from delayed off

Avoid clock off from delayed off when kickoff
is pending. This sequence is leading to mdp
clocks off and on which adds extra delay in
kickoff cycle.

Change-Id: Ia30ec3ac3c2e7602a32c9eb789cd85d4736b6c60
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>