drm/msm: minimize qos remap updates

Updating qos remap updates requires reading registers to update values,
this adds additional CPU processing when in reality this update
is only needed once.

Bug: 142504774
Change-Id: Iec8d4dfd858b0602db7d2275b6b716dbcffe0d2f
(cherry picked from commit dbd1cfbc21db4b9bd4f1a4fc234cedc314fa1265)
Signed-off-by: Adrian Salido <salidoa@google.com>
Signed-off-by: Samantha Tran <samtran@codeaurora.org>