disp: msm: dsi: reorder operations during DSI display pre kickoff

During a dynamic mode switch if the DSI clocks need to be changed,
it would result in a sequence of clock off and on operations. If
this happens after a partial update even though the commands are
sent with an asynchronous wait flag, the clock off forces the commit
thread to wait  till the DSI command wait_for_done thread is
scheduled and completed. The change ensures that the clock change is
the first operation that occurs during pre kickoff.

Change-Id: I1b4e765cd0281f1539fc4af309247f3bc0867c1b
Signed-off-by: Satya Rama Aditya Pinapala <psraditya30@codeaurora.org>