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android9: Implement jumpercable boot

See merge request !17

When booting without initramfs-tools-halium we're not setting up
/dev using udev beforehand, and finding the proper partitions
might fail. So instead, just trigger another action=add before
mounting the partitions here.

android9: add option to build rootfs based on devel channel

See merge request !16

Install extra packages from xenial_-_android9 for both devel and edge.

This improves systemimage builder to be able to fetch and generate
command files based on json files provided by the server. This removes
the need to hardcode tarball paths and versions.

This requires jq to be installed
Co-Authored-By: Dalton Durst <dalton@ubports.com>

For some reason, this --dig-holes causes images created by debos to not
work correctly when flashed with bmaptool over an unclean SD card.
Removing hole digging makes things better.

Unfortunately this adds about 1GB to flash time again and most of it is
zeroes. But at least it doesn't cause the XZ size to balloon again.

When deleting files on an ext4 system, they are of course not actually
deleted. Their blocks are only marked for reuse. That meant we were
keeping all of the deleted blocks from the system-image files. This was
about 400MB of xz-compressed data which wouldn't compress again and
greatly slowed down compressors. To make things worse, bmap-tools didn't
know the data was unused and caused it to be written out to the final
device. Ugh!

The zerofree tool fixes this by finding the blocks and zeroing them. A
further 'fallocate --dig-holes' then takes these zeroes and converts
them back into unused space on the host.

Another option was dd'ing a bunch of zeroes then deleting, but that
would cause the file to balloon to its full size first and slow down the
build. Finally, 'fstrim' could be used for this if the virtual disks
used by debos supported discard and used it correctly. They do not.

android9: Load incall audio modules

See merge request !12

Make it possible to build more system-image images by making the builder
more generic, allowing it to take image names as parameters. Then use
that to build a PineTab image too.

Also create the ext4 partitions with the metadata_csum feature disabled
so the 16.04 e2fsck will work on them.

Install gst-droid and qtubuntu-position to Android 9 rootfs

See merge request !10

Add config file for building Android 9 rootfs

See merge request !9

Done in https://github.com/ubports/lxc-android-config/commit/0958fa134c171fa36589b8d2720b7b7601effdd3 instead.

This commit is for upstream rootfs, please revert when porting
a new device.

It is already handled inside LXC android container config