Clean up atrace.rc

Moving boot trace related things to perfetto.rc

Ensure that tracing is turned off by default only if boot tracing
isn't enabled.

Bug: 271576143
Test: Manually checked that tracing works
Change-Id: I89e2bc0abe111bed4a230619afa544c214c10e6e
Merged-In: I89e2bc0abe111bed4a230619afa544c214c10e6e