Don't printout absolute path to the original source

They are make Java files generated from the same *.aidl file but in
different paths be different, which might cause trouble to the build
cache server.

The path to the original file doesn't seem to be necessary because the
path is already encoded in the intermediate directory where the
generated files are (e.g.,
out/soong/.intermediate/<path>/<module>/gen/aidl/<path>/IXxxx.java)

Bug: 121251997
Test: aidl_unittests
Change-Id: I337a217fef7852fe0e5f683cc239508e982f4fc4
8 files changed