Revert "Revert "Suppress NewApi warnings for @SystemApi -> public APIs""

This reverts commit f4e3fdcdf56898b9d104dc01de07daa83037cffe.

Reason for revert: Re-landing changes not related to postsubmit failure

Change-Id: Icfd94bc3a315fa938c05b5804fbd2a086a2c47f3
5 files changed