sunxi: Sync sun8i dts files with the linux kernel

Copy over all the latest dts changes from mripard/sunxi/dt-for-4.2.
This adds a dts file for Sinlinx SinA33 dev board, and the required
changes in the .dtsi files.

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