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

cc/binary.go

@@ -353,6 +353,11 @@ func (binary *binaryDecorator) link(ctx ModuleContext,
 }
 
 func (binary *binaryDecorator) install(ctx ModuleContext, file android.Path) {
+	// <recovery>/bin is a symlink to /system/bin. Recovery binaries are all in /sbin.
+	if ctx.inRecovery() {
+		binary.baseInstaller.dir = "sbin"
+	}
+
 	binary.baseInstaller.install(ctx, file)
 	for _, symlink := range binary.Properties.Symlinks {
 		binary.symlinks = append(binary.symlinks,