ARM: dts: rockchip: Remove "regulator-always-on" in vcc_rmii for Radxa Rock

On Rockchip RK3188 SoCs the platform driver emac_rockchip is used. This variant driver
enables this regulator when the device driver is loaded. The phy no longer needs
to be always on.
Signed-off-by: Romain Perier <romain.perier@gmail.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm/boot/dts/rk3188-radxarock.dts

@@ -186,7 +186,6 @@ vcc_rmii: REG9 {
 				regulator-name = "VCC_RMII";
 				regulator-min-microvolt = <3300000>;
 				regulator-max-microvolt = <3300000>;
-				regulator-always-on;
 			};
 
 			vccio_wl: REG10 {