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/board/sunxi/MAINTAINERS b/board/sunxi/MAINTAINERS
index 2cb8a75..4f8d950 100644
--- a/board/sunxi/MAINTAINERS
+++ b/board/sunxi/MAINTAINERS
@@ -58,6 +58,7 @@
 F:	configs/orangepi_one_defconfig
 F:	configs/orangepi_pc_defconfig
 F:	configs/orangepi_plus_defconfig
+F:	configs/polaroid_mid2407pxe03_defconfig
 F:	configs/polaroid_mid2809pxe04_defconfig
 F:	configs/q8_a23_tablet_800x480_defconfig
 F:	configs/q8_a33_tablet_800x480_defconfig