Make soong-shared public

Test: m
Change-Id: I2e25b115c863434ed7f167a4333e30423801682a
diff --git a/shared/Android.bp b/shared/Android.bp
index d5e8614..2092869 100644
--- a/shared/Android.bp
+++ b/shared/Android.bp
@@ -17,4 +17,6 @@
     deps: [
         "golang-protobuf-proto",
     ],
+    // Used by plugins
+    visibility: ["//visibility:public"],
 }