[SB Refactor] Update the mobile activity logs to be in and out.

We want to avoid calling `toString()` if we can, so it's better to log
the two booleans that are part of the activity.

Bug: 238425913
Test: Manual: Dumped MobileConnectionLog[3] and verified logs
Change-Id: I14d4907c3a7bf1f73aeae8627038bd021805edcd