Expose ota_metadata_proto for consumption

Recovery needs to parse OTA metadata and perform various safety checks

Test: th
Change-Id: Ibbfa55a8ec8a15d37adb57299ed6ee89b06ba368

tools/releasetools/Android.bp

@@ -114,6 +114,20 @@ python_library_host {
     },
 }
 
+cc_library_static {
+    name: "ota_metadata_proto_cc",
+    srcs: [
+       "ota_metadata.proto",
+    ],
+    host_supported: true,
+    recovery_available: true,
+    proto: {
+        canonical_path_from_root: false,
+        type: "lite",
+        export_proto_headers: true,
+    },
+}
+
 java_library_static {
     name: "ota_metadata_proto_java",
     host_supported: true,