[Buildroot] Requirements for QML in RPi4

[Andrea Simeoni]

After several years I'm going to give another try to Buildroot :-)
This time I built an environment for RPi4+Qt5.
Surely I missed some packages because if I try to run a QML application I
got the following error:

> Could not find DRM device!
> Aborted

Instead a Qt5 console application seems to run fine.

I attach my .config file. Hope you can give me some hints!
Best regards
Andrea
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