ARM: dts: msm: Add CX regulator Phandle to MDP node

The Phandle might change for different
versions of the msm8974 chip. Add the Phandle
of CX regulator to only v2 version.

Change-Id: Ifce120fcb349360e36c4ea74bcaf5ea14e1dece5
Signed-off-by: Chandan Uddaraju <chandanu@codeaurora.org>
diff --git a/arch/arm/boot/dts/msm8974-v2.dtsi b/arch/arm/boot/dts/msm8974-v2.dtsi
index 0da5658..238f02c 100644
--- a/arch/arm/boot/dts/msm8974-v2.dtsi
+++ b/arch/arm/boot/dts/msm8974-v2.dtsi
@@ -81,6 +81,7 @@
 	qcom,mdss-has-bwc;
 	qcom,mdss-has-decimation;
 	qcom,mdss-ad-off = <0x0013100 0x00013300>;
+	vdd-cx-supply = <&pm8841_s2_corner>;
 };
 
 &mdss_hdmi_tx {