Support for recovery snapshot.

Bug: 171231437

Test: source build/envsetup.sh
Test: ALLOW_MISSING_DEPENDENCIES=true m -j nothing

Change-Id: I74636cf7f97e027a229a5ef7c776f2b7a42ead95

cc/genrule.go

@@ -75,7 +75,15 @@ func (g *GenruleExtraProperties) VendorRamdiskVariantNeeded(ctx android.BaseModu
 }
 
 func (g *GenruleExtraProperties) RecoveryVariantNeeded(ctx android.BaseModuleContext) bool {
-	return Bool(g.Recovery_available)
+	// If the build is using a snapshot, the recovery variant under AOSP directories
+	// is not needed.
+	recoverySnapshotVersion := ctx.DeviceConfig().RecoverySnapshotVersion()
+	if recoverySnapshotVersion != "current" && recoverySnapshotVersion != "" &&
+		!isRecoveryProprietaryModule(ctx) {
+		return false
+	} else {
+		return Bool(g.Recovery_available)
+	}
 }
 
 func (g *GenruleExtraProperties) ExtraImageVariations(ctx android.BaseModuleContext) []string {