arm64: tegra: Add XUSB powergates on Tegra210

The Tegra210 XUSB subsystem has 3 power partitions which are XUSBA
(super-speed logic), XUSBB (USB device logic) and XUSBC (USB host
logic). Populate the device-tree nodes for these XUSB partitions.
Signed-off-by: NJon Hunter <jonathanh@nvidia.com>
Signed-off-by: NThierry Reding <treding@nvidia.com>

arch/arm64/boot/dts/nvidia/tegra210.dtsi

@@ -646,6 +646,30 @@
 				resets = <&tegra_car 198>;
 				#power-domain-cells = <0>;
 			};
+
+			pd_xusbss: xusba {
+				clocks = <&tegra_car TEGRA210_CLK_XUSB_SS>;
+				clock-names = "xusb-ss";
+				resets = <&tegra_car TEGRA210_CLK_XUSB_SS>;
+				reset-names = "xusb-ss";
+				#power-domain-cells = <0>;
+			};
+
+			pd_xusbdev: xusbb {
+				clocks = <&tegra_car TEGRA210_CLK_XUSB_DEV>;
+				clock-names = "xusb-dev";
+				resets = <&tegra_car 95>;
+				reset-names = "xusb-dev";
+				#power-domain-cells = <0>;
+			};
+
+			pd_xusbhost: xusbc {
+				clocks = <&tegra_car TEGRA210_CLK_XUSB_HOST>;
+				clock-names = "xusb-host";
+				resets = <&tegra_car TEGRA210_CLK_XUSB_HOST>;
+				reset-names = "xusb-host";
+				#power-domain-cells = <0>;
+			};
 		};
 	};