arm64: dts: amlogic: replace underscores in node names

Underscores should not be used in node names (dtc with W=2 warns about
them), so replace them with hyphens.

Cc: Marc Gonzalez <mgonzalez@freebox.fr>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240213143217.336341-1-krzysztof.kozlowski@linaro.org
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>

arm64: dts: meson-g12b: move common node into new odroid.dtsi

In order to introduce Odroid-N2L which is basically an Odroid-N2+
without some on-board peripherals (Ethernet, RTC, Hub, Jack),
move the common nodes into a new meson-g12b-odroid.dtsi which will
will be the common dtsi for all the Odroid-N2 derived boards.

Link: https://lore.kernel.org/r/20230122-topic-odroid-n2l-upstream-initial-v2-2-8d3fea6d403d@linaro.org
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>