tp: ensure that binder transaction ids are always positive in systrace
tp: ensure that binder transaction ids are always positive in systrace

Catapult does not like negative transaction ids even though the printf
format code for all binder events is %d.

Ensure that we only output positive numbers to prevent catapult from
crashing.

Bug: 152996714
Change-Id: I4ee7b1fc662216587dc4a90e3acd67c986431701
google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto