Provide additional target variant of okhttp-norepackage prebuilt

The okhttp-norepackage already provides host prebuilts but the
grpc-grpc-java library needs target variants too.

Bug: 193044041
Test: DIST_DIR=$PWD/dist TARGET_BUILD_VARIANT=userdebug art/build/build-art-module.sh --skip-apex
      packages/modules/ArtPrebuilt/update-art-module-prebuilts.py --local-dist=dist --skip-cls --skip-apex
      - check that odrefresh is added
Change-Id: Id1060fb088d5a0cc0aba2ca161f8f34af463f013
1 file changed