ARM: tegra: trimslice: Initialize PCIe from DT

With the device tree support in place, probe the PCIe controller from
the device tree and remove the corresponding workaround in the board
file.
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>

arch/arm/boot/dts/tegra20-trimslice.dts

@@ -310,6 +310,16 @@ pmc {
 		nvidia,sys-clock-req-active-high;
 	};
 
+	pcie-controller {
+		status = "okay";
+		pex-clk-supply = <&pci_clk_reg>;
+		vdd-supply = <&pci_vdd_reg>;
+
+		pci@1,0 {
+			status = "okay";
+		};
+	};
+
 	usb@c5000000 {
 		status = "okay";
 		nvidia,vbus-gpio = <&gpio TEGRA_GPIO(V, 2) GPIO_ACTIVE_HIGH>;
@@ -413,6 +423,24 @@ vbus_reg: regulator@2 {
 			enable-active-high;
 			gpio = <&gpio TEGRA_GPIO(V, 2) 0>;
 		};
+
+		pci_clk_reg: regulator@3 {
+			compatible = "regulator-fixed";
+			reg = <3>;
+			regulator-name = "pci_clk";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+			regulator-always-on;
+		};
+
+		pci_vdd_reg: regulator@4 {
+			compatible = "regulator-fixed";
+			reg = <4>;
+			regulator-name = "pci_vdd";
+			regulator-min-microvolt = <1050000>;
+			regulator-max-microvolt = <1050000>;
+			regulator-always-on;
+		};
 	};
 
 	sound {