Prevent dynamically created java_api_contribution from inheriting

parent modules' visibility

By default, dynamically created module inherits the parent module's
visibility. When the parent module's visibility is set to
"//visibility:private" or has any other specified visibility
restrictions in the module definition,  the created
java_api_contribution module is not visible to java_api_library.
Thus, override any inherited visibility properties and set the visiblity
of the created java_api_contribution module to public.

Test: m
Change-Id: I5db60a5a1800e2ae28c9650eeb9a2f1c3b4f8989