Merge "Lower the volume for tone generator tones in Telecom." into udc-dev am: a8618ee9

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/services/Telecomm/+/21940364



Change-Id: I66f601d68ac5b1061d94fa88fe44be6b0da42228
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>