ARM: sunxi: Add Allwinner A23 dtsi

The Allwinner A23 is a tablet oriented SoC with 2 Cortex-A7 cores
and a Mali-400MP2 GPU.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
ARM: sun8i: dt: Add Ippo-q8h v5 support

The Ippo-q8h is a tablet circiut board commonly found in cheap Android
tablets with A23 SoCs. There are at least 2 versions of the board, with
different peripherals, such as WiFi chips.

This patch add supports for v5 of such boards, which has a ESP8089 WiFi
chip (not supported) connected to mmc1.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>