sunxi: add basic memory map definitions of H6 SoC

sunxi: add basic memory map definitions of H6 SoC

The Allwinner H6 SoC come with a totally new memory map.

Add basical definition of the new memory map into a header file, and let
the cpu.h header include it in the situation of H6.

Signed-off-by: Icenowy Zheng <[email protected]>
Reviewed-by: Andre Przywara <[email protected]>
Acked-by: Maxime Ripard <[email protected]>
Reviewed-by: Jagan Teki <[email protected]>
Tested-by: Jagan Teki <[email protected]>