msm: kgsl: Change vdd_dig to vddcx

Change GPU digital circuit head switch name to vddcx to match
devicetree property name convention.

Change-Id: If17b47125f08873106f74fdb21a29c58dbf1496a
Signed-off-by: Pu Chen <puchen@codeaurora.org>
diff --git a/drivers/gpu/msm/kgsl_pwrctrl.h b/drivers/gpu/msm/kgsl_pwrctrl.h
index 954c818..cd44152 100644
--- a/drivers/gpu/msm/kgsl_pwrctrl.h
+++ b/drivers/gpu/msm/kgsl_pwrctrl.h
@@ -50,7 +50,7 @@
 	unsigned int interval_timeout;
 	bool strtstp_sleepwake;
 	struct regulator *gpu_reg;
-	struct regulator *gpu_dig;
+	struct regulator *gpu_cx;
 	uint32_t pcl;
 	unsigned int nap_allowed;
 	unsigned int idle_needed;