USB-Audio: Solid State Labs SSL 2 - fix capture channels

USB-Audio: Solid State Labs SSL 2 - fix capture channels

Same fix as for SSL+, commit fc17ed4.
Capture configuration is the same, with 4 channels.

  Capture:
    Status: Stop
    Interface 2
      Altset 1
      Format: S32_LE
      Channels: 4
      Endpoint: 0x81 (1 IN) (ASYNC)
      Rates: 44100, 48000, 88200, 96000, 176400, 192000
      Data packet interval: 125 us
      Bits: 24
      Channel map: FL FR FC LFE

Closes: https://github.com/alsa-project/alsa-ucm-conf/pull/566
Signed-off-by: Flo <flo@fino.fr>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>