Remove some mutation mLock usages

Uses previously added package state mutation commit APIs which enforce
a read -> diff -> commit cycle for editing package state.

Migrates several usages of mLock for this write mutation.

Bug: 202291547

Test: presubmit, too general of a change for specific test

Change-Id: Icf20dc74b92e79f874daeddadde88093aa4dca4e