Add obj-c mapping from native configuration to RTCConfiguration
Add obj-c mapping from native configuration to RTCConfiguration

Bug: webrtc:9719
Change-Id: Id48c3760be516c47e8d4c7267d84111385924776
Reviewed-on: https://webrtc-review.googlesource.com/c/108744
Reviewed-by: Kári Helgason <79949f6d84ac41ff1f64c59fd5a554be5ff12a02@webrtc.org>
Commit-Queue: Peter Slatala <7380603cea218c08053abc8e2257a75ccb7371d4@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#25450}
TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc