msm: kgsl: Do not disable rgmu irq twice on error case

During the GPU wakeup sequence if GMU_FAULT is set
we change the state to RESET to ensure rgmu_suspend()
called to recover from GMU_FAULT. We already have
the disable irq in rgmu_suspend(), So don’t disable irq
on rgmu error case.

Change-Id: I19f111195ebb01633899320e77c23689357d8852
Signed-off-by: Hareesh Gundu <hareeshg@codeaurora.org>