dt-bindings: arm: sunxi: Add NetCube Systems Nagami SoM and carrier board bindings

dt-bindings: arm: sunxi: Add NetCube Systems Nagami SoM and carrier board bindings

The NetCube Systems Nagami is an System on Module base on the Allwinner
T113s SoC. It is intended to be used in low cost devices which require
simple layouts and low BOM cost.

The NetCube Systems Nagami Basic Carrier Board is a simple carrier for the
Nagami SoM. It is intended to serve as a simple reference design for a
custom implementation or just evaluating the module with other peripherals

The NetCube Systems Nagami Keypad Carrier is a custom board intended to
fit a standard Ritto Intercom enclosure and provides a Keypad, NFC-Reader
and Status-LED all controllable over Ethernet with PoE support.

Signed-off-by: Lukas Schmid <lukas.schmid@netcube.li>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://patch.msgid.link/20250831162536.2380589-2-lukas.schmid@netcube.li
Signed-off-by: Chen-Yu Tsai <wens@csie.org>