Support recovery and recovery_available

`recovery: true` installs a module to the recovery partition.
`recovery_available: true` makes a module to be available to other
`recovery:true` or `recovery_available: true` modules.

These to are very similar to vendor, vendor_available properties, except
for the target partition.

Bug: 67916654
Bug: 64960723
Test: m -j, toybox_recovery is installed to the recovery/root/sbin
Change-Id: Iaebe0593de16c69fa70de251a61f4d018a251509