Decode full monitor vendor name from EDID using hwdata

Test Plan:
KScreen now shows "Dell Inc." instead of DEL and
"Eizo Nano Corporation" instead of ENC in output names, which
matches closer to what's written on my monitors.

Reviewers: graesslin, davidedmundson, Plasma

Reviewed By: davidedmundson, Plasma

Subscribers: apol, feverfew, ngraham, davidedmundson, mart, kwin, sebas

Tags: KWin

Differential Revision: https://phabricator.kde.org/D10041