msm: mdss: Make sure clocks are on during kickoff

Avoid a race during kickoff when DCS commands are sent.
Keep clocks on until our irq is enabled and the start
bit is finally written.

Change-Id: I2a7fe57cd9aff0b60bc7969ff514203ee5c72e1b
msm: mdss: Fix error handling in DSI panel on sequence

Change-Id: I5abad64202b631a71f534e67cf6d590c6c702029