Kick channel off PBDMA before writing new sync point id to allowed
sync points.
Bug 1648297
Bug 1646477
Change-Id: I7c686d474c403fdd54bc64cff63b7d049feecb4d
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/750981