drm/msm/a6xx: Remove duplicate irq disable from remove

a6xx_gmu_stop() already calls this function via shutdown or force_stop,
so it's not necessary to call it twice. Previously this would have
knocked the irq refcount out of sync, but now with the irqs_enabled flag
it's just housekeeping.

Changes in v2:
- None

Cc: Jordan Crouse <jcrouse@codeaurora.org>
Reviewed-by: NJordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: NSean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190523171653.138678-2-sean@poorly.run

drivers/gpu/drm/msm/adreno/a6xx_gmu.c

@@ -1239,7 +1239,6 @@ void a6xx_gmu_remove(struct a6xx_gpu *a6xx_gpu)
 		dev_pm_domain_detach(gmu->gxpd, false);
 	}
 
-	a6xx_gmu_irq_disable(gmu);
 	a6xx_gmu_memory_free(gmu, gmu->hfi);
 
 	iommu_detach_device(gmu->domain, gmu->dev);