fix: consider DSI display to be embedded panel

Summary:
DSI connector type is widely used in mobile and tablet devices. Consider
them embedded so auto-rotation feature is available.

Test Plan: tested on pinephone and pinetab which have a DSI displays

Reviewers: romangg, davidedmundson

Reviewed By: davidedmundson

Subscribers: davidedmundson, plasma-devel

Tags: Plasma

Differential Revision: https://phabricator.kde.org/D27806