Add visibility for rtc_vp9_profile
Add visibility for rtc_vp9_profile

This is necessary to access profiles from Chrome side.

Bug: webrtc:7925
Change-Id: I27d187afb56da715caf9f2ac8a6942778853542c
Reviewed-on: https://webrtc-review.googlesource.com/c/113100
Reviewed-by: Erik Språng <3ab8c90c99d6dd7822e0fad803ab0211dd287ae5@webrtc.org>
Commit-Queue: Emircan Uysaler <4f4cc7487b5e739a8a7d6463b8e18c84b5876be1@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#25925}
ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc