Merge "DSDA: Support "Add call" from 2nd sub" into udc-dev am: 374b1ebd

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/services/Telecomm/+/21535964



Change-Id: I2cdeacf80b75ec018516e6cca7e2bfc96882e227
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>