Make kotlinx_coroutines_guava publicly visible

Test: builds
Change-Id: Iafcdbbfb7c56102ec663df2d96dfb0766025e312
Merged-In: Iafcdbbfb7c56102ec663df2d96dfb0766025e312
(cherry picked from commit acf343dfb3c1817bf312db4fdd51c4beea7e83cf)
diff --git a/Android.bp b/Android.bp
index a0a2c3b..a1bf13d 100644
--- a/Android.bp
+++ b/Android.bp
@@ -225,5 +225,6 @@
         "//apex_available:platform",
         "//apex_available:anyapex",
     ],
+    visibility: ["//visibility:public"],
 }