Documentation: sunxi: Update Allwinner SoC documentation
Documentation: sunxi: Update Allwinner SoC documentation

Since that document was first submitted, some new SoCs have been
announced/released by Allwinner. Update the documentation to mention
those and the related documents.

Signed-off-by: Maxime Ripard <2d324f4ca95610bde432fa2af2f28cd21110687d@free-electrons.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs