Merge "Expose Telecom constants for use in Telephony" am: 9fcb2819d0 am: 1bf919f084 am: 5b6beb2fc0 am: 2f8cf2f852

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1427473

Change-Id: Ib461b9a4f7271b9f9263cae8292dc5d0579fc102