sunxi: Add defconfig and dts file for Polaroid MID2407PXE03 tablet

The Polaroid MID2407PXE03 is an a23 based 7" tablet based on a M86_MB V2.0
PCB, featuring a 800x480 LCD, 512MB RAM, 4G NAND, esp8089 wifi, gsl1680
touchschreen, micro-sd slot, 3.5mm headphone jack and a micro-usb otg
connector which doubles as charging port.

The dts file is identical to the one submitted to the upstream kernel.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
diff --git a/arch/arm/dts/axp22x.dtsi b/arch/arm/dts/axp22x.dtsi
index 0cfec50..458b668 100644
--- a/arch/arm/dts/axp22x.dtsi
+++ b/arch/arm/dts/axp22x.dtsi
@@ -141,5 +141,15 @@
 			regulator-max-microvolt = <3000000>;
 			regulator-name = "rtc_ldo";
 		};
+
+		reg_drivevbus: drivevbus {
+			regulator-name = "drivevbus";
+			status = "disabled";
+		};
+	};
+
+	usb_power_supply: usb_power_supply {
+		compatible = "x-powers,axp221-usb-power-supply";
+		status = "disabled";
 	};
 };