Revert "msm: kgsl: Enable A6XX preemption through sysfs"

This reverts commit 38e57d7a6545470553765d7f0f1f590cca9c6fea.

1. This removes the bifurcation of preemption setup and execution
paths. Preemption is stable and can both setup and execution
can be enabled.
2. Currently preemption is enabled for all devices. Remove that
and selectively enable preemption for a630 in device features in
adreno-gpulist.h

Change-Id: I5e72b1a62bcb6ecffb655d41d1597655a3f11a0c
Signed-off-by: Harshdeep Dhatt <hdhatt@codeaurora.org>
diff --git a/drivers/gpu/msm/adreno_dispatch.c b/drivers/gpu/msm/adreno_dispatch.c
index 0caf55b..472f78e 100644
--- a/drivers/gpu/msm/adreno_dispatch.c
+++ b/drivers/gpu/msm/adreno_dispatch.c
@@ -2141,7 +2141,7 @@
 	 * Deleting uninitialized timer will block for ever on kernel debug
 	 * disable build. Hence skip del timer if it is not initialized.
 	 */
-	if (adreno_is_preemption_execution_enabled(adreno_dev))
+	if (adreno_is_preemption_enabled(adreno_dev))
 		del_timer_sync(&adreno_dev->preempt.timer);
 
 	mutex_lock(&device->mutex);