msm: kgsl: Remove WPTR drop prevention workaround

The WPTR drop prevention workaround added earlier is seen to cause
vague GPU hangs while running 3DMM06 app. So removing it.

Change-Id: I30bd784559d133025f3657386b94bb18ee939d37
CRs-Fixed: 309787
Signed-off-by: Ranjhith Kalisamy <ranjhith@codeaurora.org>

drivers/gpu/msm/kgsl_yamato.c

@@ -858,8 +858,7 @@ static int kgsl_yamato_start(struct kgsl_device *device, unsigned int init_ram)
 			      KGSL_DEVICE_MEMSTORE_OFFSET(ref_wait_ts),
 			      init_reftimestamp);
 
-	kgsl_yamato_regwrite(device, REG_RBBM_DEBUG, 0x000C0000);
-
+	kgsl_yamato_regwrite(device, REG_RBBM_DEBUG, 0x00080000);
 
 	KGSL_DRV_DBG("enabling RBBM interrupts  mask 0x%08lx\n",
 		     GSL_RBBM_INT_MASK);