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drm/mediatek: dsi: Manage the fact that no panel is attached

Nicolas Belin requested to merge mediatek/aiot/team-baylibre/linux:nbelin/i500-i350-hdmi-fix into mtk-v5.15-dev

Manage the fact that there is no DSI panel attached as this could be done on purpose. Thanks to that, the others DRM parts won't be blocked. But also warn the user in case it is a mistake.

In the case no panel is attached in the device tree, the current component is directly added in the probe function as the function doing that will never be called. Also nothing is done in the bind and unbind functions.

This Fixes HDMI issues on i500 and i350 platforms.

JIRA:AIOT-1180

tested with an i500-pumpkin platform with and without a DSI panel and an i350-evk platform without any panel

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