Revert "Support niceness-based priority calls"

Revert submission 3287177-priofix

Reason for revert: <Potential culprit for  b/406285562  - verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted>

Reverted changes: /q/submissionid:3287177-priofix

Change-Id: Id8018be45fa90dea5c6833cf8e65c0d331a0557d
7 files changed