Merge "Implement API to retrieve carrier configs as needed" am: 8ecc104d06

Original change: https://android-review.googlesource.com/c/platform/packages/services/Telephony/+/2466902

Change-Id: Id2cbe31d4e6ee9dd95c63f64bdabd66c7b3b68f3
Signed-off-by: Automerger Merge Worker <[email protected]>