reset carrier actions on APM

Bug: 37913717
Bug: 37850264
Test: Manual test. toggle APM
Test: runtest --path
frameworks/opt/telephony/tests/telephonytests/src/com/android/internal/telephony/CarrierActionAgentTest.java
Change-Id: Ie2d4c453438c1cabb7576e4d1aa4e61adba43c5e