msm: kgsl: Use regulator_is_enabled api when gpu-quirk-cx-gdsc is defined

When gpu-quirk-cx-gdsc is defined, cx_gdsc will not be disabled from
HLOS, so use regulator_is_enabled api to get the dummy status of cx_gdsc.

Change-Id: Ied2a54687d9438610116bf4a96a4843fdbc05c56
Signed-off-by: Pankaj Gupta <gpankaj@codeaurora.org>

drivers/gpu/msm/adreno_a6xx_gmu.c

@@ -837,6 +837,9 @@ static bool a6xx_gmu_cx_is_on(struct kgsl_device *device)
 {
 	unsigned int val;
 
+	if (ADRENO_QUIRK(ADRENO_DEVICE(device), ADRENO_QUIRK_CX_GDSC))
+		return regulator_is_enabled(KGSL_GMU_DEVICE(device)->cx_gdsc);
+
 	gmu_core_regread(device, A6XX_GPU_CC_CX_GDSCR, &val);
 	return (val & BIT(31));
 }