h616_v2

arm64: dts: allwinner: Add OrangePi Zero 2 .dts

The OrangePi Zero 2 is a development board with the new H616 SoC.

It features the usual connectors used on those small boards, and comes
with the AXP305, which seems to be compatible with the AXP805.

For more details see: http://linux-sunxi.org/Xunlong_Orange_Pi_Zero2

Signed-off-by: Andre Przywara <[email protected]>