Enables the SparkR profiles for all the binary builds we create

cc pwendell

Author: Shivaram Venkataraman <shivaram@cs.berkeley.edu>

Closes #6371 from shivaram/sparkr-create-release and squashes the following commits:

ca5a0b2 [Shivaram Venkataraman] Add -Psparkr to create-release.sh