Merge "Expose some carrier config keys for RTT" am: 4fb19f1550 am: 56f0f3a67b am: 370924cafc am: b2474e5f88

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1423856

Change-Id: Ib0b978faa37330f14e6be66ecdce91be7a79b7c1