Fix Bazel warnings

[mhucka]

Currently, building TFQ results in several Bazel warnings indicating minor issues with the build files. These are easy to fix, and doing so would reduce the noise in the logs.

Here's an example:

WARNING: /home/runner/.bazel/external/local_config_tf/BUILD:10860:8: target 'libtensorflow_framework.so' is both a rule and a file; please choose another name for the rule
WARNING: /home/runner/.bazel/external/local_config_tf/BUILD:10870:8: target 'test_log_pb2.py' is both a rule and a file; please choose another name for the rule

[mhucka]

Fixed by PR #833.