dt-bindings: arm: amlogic: document Odroid-N2L

dt-bindings: arm: amlogic: document Odroid-N2L

ODROID-N2L is a variant SBC in small form factor and some peripherals
are removed from ODROID-N2PLUS based on S922X SoC.

- On-board ethernet is removed
- On-board RTC is removed
- USB 3.0 hub is removed, so one USB 2.0 and one USB 3.0 host ports
are available
- Huge heatsink is replaced with 40x40mm heatsink, 5V active heatsink
is recommended or a tall passive sink is optional
- 3.5mm earjack is removed
- IR remote receiver is removed
- MIPI DSI port is added

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230122-topic-odroid-n2l-upstream-initial-v2-1-8d3fea6d403d@linaro.org
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>