Merge "atrace: allow tracefs/buffer_percent RW use + remove dead code" into main am: 0829ecec

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/2975539



Change-Id: I77cdeed1990e9e090b0cf9077a0852f6bfb1c25c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>