WayDroid: lets package it for postmarketOS

With WayDroid now in a somewhat usable state, it would be good to get it packaged in edge so more people can test it out and report bugs.

Unlike the old anbox, waydroid offers near-native performance, on the OnePlus 6 this means full speed Android, the ability to run games pretty much all the applications you might want. Although the device gets a fair bit warmer than when doing this on downstream Android.

• Adapt install scripts to APKBUILD
• Automate the config file generation as a post-install step
• Decide if it's best to have the large Android images be part of the package or fetched in *-install (part of the package seems best to me).
• Create new Kconfig check for waydroid (mostly just depends on BINDER stuff, as well as CONFIG_PSI and perhaps some things for networking).
• Deal with the dnsmasq dependency which will be needed to initialise networking in WayDroid.
• Come up with a solution for the bidirectional sharing data between the host user and the container without needing root to copy files.
• Find a way to handle non-integer scaling in phosh causing the Android window to not fill the screen. And a way to deal with padding needed to avoid the Android navigation bar being obscured by the Phosh one (anbox.display_height_padding=100 <- this depends on scaling).

With regards to the binder stuff, currently the lxc config files expect ANDROID_BINDER to be a module which gets probed when you first start the container and configured to create the 3 binder interfaces with specific names (prepended with anbox-), is this a good solution?

Erfanoabdi says he'll be replacing the install scripts with some kind of Python tool. Could/should we make use of this?