New board: Merrii M2 (A20)

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
a20: add LinkSprite pcDuino3 FEX file

File taken from vendor site, original comments cleaned up.

Signed-off-by: Zoltan HERPAI <wigyori@uid0.hu>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Add i12 A20 tvbox fex file

The i12 tvbox is an A20 based android tvbox, with 1G RAM, 4G nand flash,
ap6210 sdio wifi + bt (broadcom BCM43362 sdio wifi + uart attached brcm bt),
2USB host ports using USB-A receptacles and a micro-usb receptacle for USB OTG,
and 100Mbit ethernet.

The PCB is labelled i12-a20 hence I've named the board i12-a20. It is used
in noname allwinner A20 tv-boxes, which are sometimes sold with Q5 or
QT840A as product name.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>