arm64: dts: allwinner: axp803: Add drivevbus regulator

Add reg_drivevbus regualtor for boards which are using
external regulator to drive the OTG VBus through N_VBUSEN
PMIC pin.
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Chen-Yu Tsai <wens@csie.org>

arch/arm64/boot/dts/allwinner/axp803.dtsi

@@ -146,5 +146,10 @@ reg_rtc_ldo: rtc-ldo {
 			regulator-max-microvolt = <3000000>;
 			regulator-name = "rtc-ldo";
 		};
+
+		reg_drivevbus: drivevbus {
+			regulator-name = "drivevbus";
+			status = "disabled";
+		};
 	};
 };