WIP: semc-anzu: patch kernel to add/fix additional framebuffer modes, use fbset to set them for graphics environments

Apologies for the omission.

If #1088 (closed) requires any additional changes in device-semc-anzu, it's probably a good idea to delay this pull request until said changes are done.

Also, is there any official route for hooking physical buttons on a device yet? On this device, event0 handles the power button and event1 handles Volume/Back/Home/Menu keys. Plasma Mobile seems to detect both as keyboards.