Move the package back from aports to pmaports and fix fall out from
postmarketos-base-ui related breakage:
* add the subset of depends from postmarketos-base-ui that are used in
postmarketos-ondev
* upgrade to postmarketos-ondev 0.7.1, where I made it compatible with
using the default tinydm config (not just the one overridden in
postmarketos-base-ui-tinydm)
Reasoning for moving it from alpine to pmaports, in line with our new
guidelines (that were written after the package was moved to aports):
* has postmarketOS branding
* enables services in post-install (similar to postmarketos-ui-* packages)
Related: https://wiki.postmarketos.org/wiki/Packaging#Should_my_package_be_in_postmarketOS_or_Alpine.3F
