Organize MBA and APEX info with structs

This change adds a data class (actually, a parcelable, for future
testing purpose) for storing interesting MBA/APEX info. The code now
stages the data in the struct first, then calls the new method to write
the new object to the log.

Bug: 265244016
Test: manual

Change-Id: Iecc6933e6faf8b31a81ee4fae2443f3499bf099e