Clarify in comment Perfetto binary size flags. am: dce85ffe78

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2528602

Change-Id: I907d49e1f2e5b47797712a4fbcf13b04c85f50e4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>