This was a circular dependency, because plasma-framework depends on
kirigami2-dev. Furthermore it broke building, because the old
plasma-framework-dev could not be used as it depended on a package that
has been renamed.
* Add postmarketos-ui-plasma-mobile
* Add more required packages
* Upgrade plasma sources
* Modernize APKBUILDs
* Make it run in general
* Support RGB32 framebuffer with BGR order (thanks @zhuowei!)