leaudio/provider: Improve dumpsys

Add empty line and channel count

name: SingleDev_OneChanMonoSnk_16_2_1
    direction: Sink (speaker)
     number of devices: 1
     number of ASEs: 1
     target latency: 2
     strategy: 0
     qos->retransmission_number: 2
     qos->max_transport_latency: 10
     channel count: 1

  === Configurations for context type: 2, num: 21
  name: DualDev_OneChanStereoSnk_OneChanMonoSrc_16_2_Server_Preferred
    direction: Sink (speaker)
     number of devices: 2
     number of ASEs: 2
     target latency: 2
     strategy: 0
     qos->retransmission_number: 0
     qos->max_transport_latency: 0
    direction: Source (mic)
     number of devices: 1
     number of ASEs: 1
     target latency: 2
     strategy: 0
     qos->retransmission_number: 0
     qos->max_transport_latency: 0
  name: DualDev_OneChanStereoSnk_OneChanMonoSrc_16_2_1

Bug:224933710

Test: Compile
Sponsor: @jpawlowski
Change-Id: I8226c327341058a0ed106f732176ddff24f0f299