Improve the locking design inside TrafficController

Rename the mOwnerMatchMutex lock to mMutex and use it to protect all
data structures in TrafficController that could be accessed
concurrently. Add necessary annotations to the data structures needing
protection to catch unsafe access at compile time.

Test: netd_unit_test, netd_integration_test
Bug: 130334320
Change-Id: I847ce518df8626f647e1d80468e4daf4604872f2