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

android/paths.go

@@ -47,6 +47,7 @@ type ModuleInstallPathContext interface {
 
 	InstallInData() bool
 	InstallInSanitizerDir() bool
+	InstallInRecovery() bool
 }
 
 var _ ModuleInstallPathContext = ModuleContext(nil)
@@ -948,6 +949,8 @@ func PathForModuleInstall(ctx ModuleInstallPathContext, pathComponents ...string
 		var partition string
 		if ctx.InstallInData() {
 			partition = "data"
+		} else if ctx.InstallInRecovery() {
+			partition = "recovery/root"
 		} else if ctx.SocSpecific() {
 			partition = ctx.DeviceConfig().VendorPath()
 		} else if ctx.DeviceSpecific() {