Rename output stubs jar file in java_api_library

When generating framework.aidl, `android_*_stubs_current` are converted
to .aidl files (and created as targets) by replacing the extension from
`.jar` to `.aidl`.
Thus, when replacing `android_*_stubs_current` to java_api_library
modules, generating `android.jar` files leads to ninja error(multiple
rules for generating */android.aidl error).
Prevent this error by renaming the name of the artifact jar file as the
module name so that distinct-named ninja targets can be created.

Test: m
Change-Id: Iaa7248996d7bf5e7f98e1d1e2919870c3cccf5a6