Merge "simpleperf: read etm info only for online cpus." am: e8f7f20d6f am: 962c914c9c am: 60af38b8c5

Original change: https://android-review.googlesource.com/c/platform/system/extras/+/1694388

Change-Id: I3d87ea346d3326922e5a2e00c7f148a9d82af4ed