ARM: dts: imx6qdl-sabresd: Use the 'vpcie-supply' property

Since commit c26ebe98 ("PCI: imx6: Add regulator support"), it is
possible to pass the 'vpcie-supply' property to describe the PCIE supply.

This way we can remove the 'regulator-always-on' property from the
regulator and have a better device tree description.
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6qdl-sabresd.dtsi

@@ -67,7 +67,6 @@ reg_pcie: regulator@3 {
 			regulator-min-microvolt = <3300000>;
 			regulator-max-microvolt = <3300000>;
 			gpio = <&gpio3 19 0>;
-			regulator-always-on;
 			enable-active-high;
 		};
 	};
@@ -651,6 +650,7 @@ &pcie {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_pcie>;
 	reset-gpio = <&gpio7 12 GPIO_ACTIVE_LOW>;
+	vpcie-supply = <&reg_pcie>;
 	status = "okay";
 };