backend/drm: fetch EDID manufacturer from udev_hwdb

Merged Simon Ser requested to merge emersion/wlroots:edid-vendor-hwdb into master

Maintaining our internal table up-to-date is tedious: one needs to manually go through the PnP ID registry 1 and check whether we're missing any entry.

udev_hwdb already has an API to fetch a manufacturer name from its PnP ID. Use that instead.

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