Allow BoringSSL's Rust bindings to build

Bug: 177080016
Test: mm in boringssl
Change-Id: I3cdf031ebf7c5bafce00c078107fd7fb3a26ba2d
diff --git a/rust/config/allowed_list.go b/rust/config/allowed_list.go
index 802e1da..7468579 100644
--- a/rust/config/allowed_list.go
+++ b/rust/config/allowed_list.go
@@ -8,6 +8,7 @@
 	RustAllowedPaths = []string{
 		"device/google/cuttlefish",
 		"external/adhd",
+		"external/boringssl",
 		"external/crosvm",
 		"external/libchromeos-rs",
 		"external/minijail",