arm64: tegra: Remove unneeded power supplies

On Tegra186 and later, the BPMP is responsible for enabling/disabling
the PCIe related power supplies of the pad controller and there is no
need for the operating system to control them, so they can be removed.
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm64/boot/dts/nvidia/tegra186-p2771-0000.dts

@@ -119,10 +119,6 @@ padctl@3520000 {
 
 		avdd-pll-erefeut-supply = <&vdd_1v8_pll>;
 		avdd-usb-supply = <&vdd_3v3_sys>;
-		dvdd-pex-supply = <&vdd_pex>;
-		dvdd-pex-pll-supply = <&vdd_pex>;
-		hvdd-pex-supply = <&vdd_1v8>;
-		hvdd-pex-pll-supply = <&vdd_1v8>;
 		vclamp-usb-supply = <&vdd_1v8>;
 		vddio-hsic-supply = <&gnd>;