media: dt-bindings: media: convert meson-ir.txt to dt-schema

Convert the Amlogic Meson IR remote control receiver bindings to
dt-schema.

Take in account the used variant with amlogic,meson-gx-ir.

Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>