ARM: dts: imx7s: Add power domain for imx7d HSIC

Otherwise, the system will hang if USB driver try to access
portsc register.

Cc: André Draszik <git@andred.net>
Signed-off-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx7s.dtsi

@@ -658,6 +658,12 @@ pgc_pcie_phy: power-domain@1 {
 						reg = <1>;
 						power-supply = <&reg_1p0d>;
 					};
+
+					pgc_hsic_phy: power-domain@2 {
+						#power-domain-cells = <0>;
+						reg = <2>;
+						power-supply = <&reg_1p2>;
+					};
 				};
 			};
 		};
@@ -1101,6 +1107,7 @@ usbh: usb@30b30000 {
 				compatible = "fsl,imx7d-usb", "fsl,imx27-usb";
 				reg = <0x30b30000 0x200>;
 				interrupts = <GIC_SPI 40 IRQ_TYPE_LEVEL_HIGH>;
+				power-domains = <&pgc_hsic_phy>;
 				clocks = <&clks IMX7D_USB_CTRL_CLK>;
 				fsl,usbphy = <&usbphynop3>;
 				fsl,usbmisc = <&usbmisc3 0>;