binary packages for armv7

Follow up to https://gitlab.com/postmarketOS/pmbootstrap/issues/238. We have armv7 available now, but everything needs to be manually compiled for now. As expected, not everything that has armv7 in the arch line in the APKBUILD will compile for armv7 out of the box.

• try to build everything for armv7 once
• put a list of packages that failed here
• fix all packages
  • heimdall
  • qca-qt5 (!146 (merged))
• enable armv7 for all armhf packages (partially done in !130 (merged) and !131 (merged))
• make sure all packages build again
• provide all packages for armv7 in the binary repository