Update CHANGELOG for v12.1 am: 71a92399dc am: 56d95d26b9 am: ae92f63505 am: 9a3b0fa3a2
Update CHANGELOG for v12.1 am: 71a92399dc am: 56d95d26b9 am: ae92f63505 am: 9a3b0fa3a2

Original change: https://android-review.googlesource.com/c/platform/external/perfetto/+/1567900

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I5f3aa91aea7bc943530315667109d882fcfff57d

google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto