arm64: qcom: sc7280-herobrine: Enable DP

This enables DisplayPort for herobrine boards.
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220513065704.1.I9b9b9d4d1a3e0350a89221892261881a1771ad15@changeid

arch/arm64/boot/dts/qcom/sc7280-herobrine.dtsi

@@ -428,6 +428,15 @@ &mdss {
 	status = "okay";
 };
 
+&mdss_dp {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&dp_hot_plug_det>;
+	data-lanes = <0 1>;
+	vdda-1p2-supply = <&vdd_a_usbssdp_0_1p2>;
+	vdda-0p9-supply = <&vdd_a_usbssdp_0_core>;
+};
+
 &mdss_mdp {
 	status = "okay";
 };