Report stats from ChannelReceive::GetAudioFrameWithInfo at 1Hz.

This is a change from the previous 100Hz frequency.
Also changing the  locks slightly in AcmReceiver so that grabbing the
neteq lock right after we've let it go, isn't necessary inside of
AcmReceiver::GetAudio and also to avoid grabbing the neteq lock while
holding the AcmReceiver lock.

Bug: webrtc:12868
Change-Id: If6ee35f3dca20eb5bdbc615123aa099ccecf57c5
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/221371
Commit-Queue: Tommi <tommi@webrtc.org>
Reviewed-by: Minyue Li <minyue@webrtc.org>
Reviewed-by: Henrik Lundin <henrik.lundin@webrtc.org>
Reviewed-by: Markus Handell <handellm@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34258}

modules/audio_coding/neteq/neteq_impl.h

@@ -133,6 +133,7 @@ class NetEqImpl : public webrtc::NetEq {
   int GetAudio(
       AudioFrame* audio_frame,
       bool* muted,
+      int* current_sample_rate_hz = nullptr,
       absl::optional<Operation> action_override = absl::nullopt) override;
 
   void SetCodecs(const std::map<int, SdpAudioFormat>& codecs) override;