msm: kgsl: Fix GPU power state machine bug

State machine unexpected transitioned to RESET from
SUSPEND state. It caused resume from SUSPEND state
failed. Removed the unexpected transition.

CRs-Fixed: 2062115
Change-Id: Ie5e80563c3f9f8fc0f29d61f51b7edb189b1e706
Signed-off-by: George Shen <sqiao@codeaurora.org>