Merge "SystemMediaRoute2Provider: Set callback after instantiation is done" into rvc-dev am: 28932f9ecb am: 9fe15f245b am: f7d647acf0
Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11882912 Change-Id: Iafb48325a312061f6e6602f83580592be5e4e982
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