msm: sde: Fix SDE rotator clock disable sequence

It is necessary to follow a certain order when disabling the rotator
clock. Not doing so might lead to clock actually not turning off and
cause power leakage.

CRs-Fixed: 1081010
Change-Id: I16e500aa87813cd3a1e18f134ea1ed145b9e1ef8
Signed-off-by: Benjamin Chan <bkchan@codeaurora.org>