ARM: dts: sunxi: add support for NetCube Systems Nagami Basic Carrier

ARM: dts: sunxi: add support for NetCube Systems Nagami Basic Carrier

The NetCube Systems Nagami Basic Carrier is a Carrier for the Nagami SoM
It provides an ethernet port for the phy on the SoM and some USB-Ports.
All other interfaces and gpios are available on pinheader, except for the
SD-Interface which is available on a micro-sd slot.

Signed-off-by: Lukas Schmid <lukas.schmid@netcube.li>
Link: https://patch.msgid.link/20250831162536.2380589-5-lukas.schmid@netcube.li
[wens@csie.org: fix indentation for board level compatible string fallback]
Signed-off-by: Chen-Yu Tsai <wens@csie.org>