dt-bindings: media: convert Mediatek consumer IR to the json-schema

This helps validating DTS files. Introduced changes:
1. Reworded title
2. Made "bus" clock required on MT7623 as well
3. Added required #include-s and adjusted "reg" & clocks in example

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>