Merge "profcollectd: register callback to wait until ETM is ready." am: 0a57fb2b79 am: e615db8246 am: 5dcb003f12

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1972401

Change-Id: I60cebb3a06bcdd28401b0a37a0bfb0a7477005b3