Combine handling AIDL binder death

The change revive ag/22110298, which was reverted due to interaction with mock modem. The CTS issue was that upon unbinding mock modem, the mocked hal version wasn't cleared when attempting to get radio service, so the radio service is falsely considered as disabled, hence future query will always think it's disabled.

Test: atest RIL
Test: atest android/telephony/cts/TelephonyManagerTestOnMockModem.java
Test: trigger modem crash and verify recovery
Test: voice call + data browsing
Fix: 319612362

Change-Id: Id953a3c7ec6c52b5b81f8828a286b2da91bec46b