msm: kgsl: Continue stopping GMU if it cannot idle

If the GMU does not idle after the timeout the stop
sequence is aborted. This causes a bug where the RPMh
wake / sleep sequences are not in sync and that leaves
the system in an incorrect state.

Force the system to continue stopping the GMU in either
case to prevent this.

CRs-Fixed: 2017390
Change-Id: Ide875c52e364345925917301c978381ba0c2ebee
Signed-off-by: Kyle Piefer <kpiefer@codeaurora.org>