Add fault address marker in proto to tombstone.

When the switch was made to dump the tombstone from the protobuf,
the fault address marker in the maps section went missing. Re-add
that logic and add new unit tests to verify all of the different
behaviors.

Bug: 193935960

Test: All unit tests pass.
Test: All unit tests pass when setprop debug.debuggerd.translate_proto_to_text 0
Test: The above on cuttlefish, 32 bit and 64 bit.
Test: The above on a flame, 32 bit and 64 bit.
Change-Id: I098bb6ab4bacacae2ca0fc5ec9a73549ed0b9489