Handle prebuiltDepTag for java modules

When there is a prebuilt java lib defined and there is a java library
with the same name, the reverse dependency from the java lib to the
prebuilt lib is added. However, the java library didn't recognize the
dependency type and causes error. Fixing the problem by not panicking on
such dependency.

Test: m -j
Test: m -j dist DIST_DIR=out/dist ANDROID_BUILDSPEC=vendor/google/build/app_build_spec.mk
Change-Id: I79673b2bb382100e42c5336e8041daa8c86fa857