Introduce the REPORT_USAGE_STATS permission.

This is a new signature|module permission which will only be held by
the system and mainline modules. It will be required to report any
usage events to UsageStatsManager.

Bug: 296056771
Test: atest CtsUsageStatsTest
Change-Id: Icc4c00452551b65ce92c1c5f7688108f1bbc2423