[SPARK-8064] [BUILD] Follow-up. Undo change from SPARK-9507 that was accidentally reverted

This PR removes the dependency reduced POM hack brought back by #7191

Author: tedyu <yuzhihong@gmail.com>

Closes #7919 from tedyu/master and squashes the following commits:

1bfbd7b [tedyu] [BUILD] Remove dependency reduced POM hack