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hook-functions: dep_add_modules: Properly include panel drivers

Alper Nebi Yasak requested to merge alpernebbi/initramfs-tools:dep-add-panels-properly into master

With MODULES=dep, we try to walk the /sys/devices/platform/edp-panel device to include panel drivers because they are needed get a display output on some devices. This is a bit wrong, because the "edp-panel" here is the name of a device-tree node that is not necessarily a panel.

Instead, walk the devices bound under the panel drivers for modules to add to initramfs. Check not only for panel-edp, but panel-simple and those available over dp-aux bus as well.

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