audio: Add devices preference set pref This is a dictionary pref that maps a set of devices to the user preferred device among the set. Bug: b/328425880 Test: AudioDevicesPrefHandlerTest,CrasAudioHandlerTest Change-Id: Ie52d9796f328d98a9ee73bf7bbf3f200f00a9030 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5551438 Reviewed-by: Camden Bickel <cambickel@google.com> Reviewed-by: Xiaoqian Dai <xdai@chromium.org> Commit-Queue: Wenyu Zhang <zhangwenyu@google.com> Cr-Commit-Position: refs/heads/main@{#1307510}
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