Recent devices (e.g. Pixel 2XL aka taimen) do not define any "system"
partition in their fstab, so a plain "mount /system" fails.
Furthermore, trying to get the entry from /etc/recovery.fstab also fails
because the partitions have slot suffixes (e.g. system_a).
So for these devices, we need to figure out the active slot, mount the
system partition (which really contains the whole root) and lastly mount
the actual system partition from the rootfs.
Change-Id: Ibb73a82896c1f6ce6af9c334b8d0908a183913b9
Run 'make addonsu' to make a flashable zip to install the addon and
'make addonsu-remove' for a flashable zip that removes it.
Change-Id: I5b2fe67f98f2474b923c074dc6025b47c6db2ae0
Christopher N. Hesse
Gabriele M