msm/sde/rotator: disable rotator clock during pm suspend

In few cases, rotator sessions can be opened when pm suspend
is called. Its corresponding clock votes are removed before
pm_suspend and added back when pm_resume occurs.

Change-Id: Ic7f4ea98a51c31949933fb9145a088d1e70bc3c3
Signed-off-by: Jayaprakash <jmadiset@codeaurora.org>