arm64: dts: qcom: ipq8074-hk01: Add dummy supply for QMP USB3 PHY

Per QMP PHY bindings schema, 'vdda-phy-supply' and 'vdda-phy-supply' are
required for IPQ8074 QMP USB3 PHY.  Since supplies are not added in DTS
for this platform, add a dummy regulator as the supply to QMP USB3 PHY,
so that dtbs_check stops complaining the missing supplies.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20210929034253.24570-10-shawn.guo@linaro.org

arch/arm64/boot/dts/qcom/ipq8074-hk01.dts

@@ -24,6 +24,8 @@ memory@40000000 {
 		device_type = "memory";
 		reg = <0x0 0x40000000 0x0 0x20000000>;
 	};
+
+	vreg_dummy: regulator-dummy { };
 };
 
 &blsp1_i2c2 {
@@ -97,10 +99,14 @@ &qusb_phy_1 {
 
 &ssphy_0 {
 	status = "okay";
+	vdda-phy-supply = <&vreg_dummy>;
+	vdda-pll-supply = <&vreg_dummy>;
 };
 
 &ssphy_1 {
 	status = "okay";
+	vdda-phy-supply = <&vreg_dummy>;
+	vdda-pll-supply = <&vreg_dummy>;
 };
 
 &usb_0 {