Support Rust in Recovery

Bug: 178565008
Bug: 165791368
Test: Build and link a Rust library into a recovery binary
Change-Id: I1c76e6204019443c567082730a4cf680f4a2a74a
diff --git a/cc/androidmk.go b/cc/androidmk.go
index bda1006..df3776c 100644
--- a/cc/androidmk.go
+++ b/cc/androidmk.go
@@ -29,7 +29,7 @@
 	VendorSuffix        = ".vendor"
 	ramdiskSuffix       = ".ramdisk"
 	VendorRamdiskSuffix = ".vendor_ramdisk"
-	recoverySuffix      = ".recovery"
+	RecoverySuffix      = ".recovery"
 	sdkSuffix           = ".sdk"
 )