msm: sde: Reduce SDE rotator done signaling time

When rotator job finished, driver needs to send out done signaling to
notify fbdev driver to perform a commit. However, there are occasions
that the SMMU disabling take quite long time and delaying the fbdev
commit time. To reduce this unpredict latency, move the SMMU disabling
much later in the rotator done handling, and also remove unnecessary
SMMU disabling call during commit phase.

CRs-Fixed: 1100633
Change-Id: I76ad017661aa6f760a2adc3579f59a7b66ab8e40
Signed-off-by: Benjamin Chan <bkchan@codeaurora.org>
Signed-off-by: Narendra Muppalla <NarendraM@codeaurora.org>