Integrate linux-mtk/mtk-v5.15-seco_lvds

Commit: seco-ne/kernel/linux-mtk@0691f0a3

dts:seco-genio-common.dtsi: mediatek dsi-driver repaired to support bridges

• dummy bridge-driver changed to sn65dsi84
• all the wiring is done in in the base-dt rather than in the overlays

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Commit: seco-ne/kernel/linux-mtk@56b1165d

drivers:gpu:drm:mediatek:mtk_dsi.c: dsi-driver repaired to support bridges

• component_add() must be called by probe() to make things work at all
• the determination of the next bridge has been moved from host_attach() to bridge_attach() because in host_attach() it is to late