boards:sunxi: add ybkj a20 jn htpc

Renamed to properly reflect the unique name of this device.

Signed-off-by: Luc Verhaegen <libv@skynet.be>
board:sunxi: add t702a tablet

Signed-off-by: Luc Verhaegen <libv@skynet.be>
scripts: add script to check for duplicate sunxi dram files

Signed-off-by: Julian Calaby <julian.calaby@gmail.com>
scripts: add description to sunxi_dram_duplicates script

Signed-off-by: Luc Verhaegen <libv@skynet.be>
sunxi-mmc: sun8i has its fifo at a different address

This fixes the mmc code no longer working on sun8i after the changes to
stop using dma, like sun6i.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Hans de Goede <hdegoede@redhat.com>