rockchip: dts: rk3399-puma: update usbhub_enable regulator

To correctly model the usbhub_enable regulator for U-Boot, we need
to change the settings to:
 * the GPIO polarity is GPIO_ACTIVE_LOW
 * should be set to inactive (enable-active-low) when boot-on settings
   are applied
 * it can be changed at runtime (i.e. remove the always-on)
Signed-off-by: NPhilipp Tomsich <philipp.tomsich@theobroma-systems.com>
Tested-by: NKlaus Goger <klaus.goger@theobroma-systems.com>

arch/arm/dts/rk3399-puma.dtsi

@@ -94,8 +94,7 @@
 		compatible = "regulator-fixed";
 		regulator-name = "usbhub_enable";
 		enable-active-low;
-		gpio = <&gpio4 3 GPIO_ACTIVE_HIGH>;
-		regulator-always-on;
+		gpio = <&gpio4 3 GPIO_ACTIVE_LOW>;
 		regulator-boot-on;
 		regulator-min-microvolt = <3300000>;
 		regulator-max-microvolt = <3300000>;