Add a new log event to make parsing EXTRA_ANSWERING_DROPS_FG_CALL easier

Flag: EXEMPT logging only change
Test: atest CtsTelecomTestCases; atest CtsTelecomCujTestCases
Bug: 397880544
Change-Id: I5669ffc5743699dec07e5d5698d9011e5b7714fc
2 files changed