Deprecate producer/consumer usage: Step 2

Clean up bufferhub_rpc, display_rpc and service side producer/consumer
usage reference.

Next (final) step is to remove all remaining client side reference to
producer/consumer usage and update dvr_xxx API.

This also fixes a minor typo in dvr_named_buffer-test

Bug: 37881101
Test: Build, flash, ran particles.apk and buffer_hub_queue-test
Change-Id: Ibae4376c1fd1ed964843d8b2ad2fb27204fe5e28