During Speaker playback, quad Channel I/V feedback data is captured from SSP0 Rx. Out of these 4-channels, Stereo V-Sense data needs to be given as echo ref stream. So, adding stereo capture config to max98373_capture_formats. BUG=b:110074225 TEST='Audio playback and Capture Stereo echo ref data' Change-Id: I6fe619ece94d5011caffe37ef10b48f956938db9 Signed-off-by: Sathyanarayana Nujella <sathyanarayana.nujella@intel.com> Reviewed-on: https://review.coreboot.org/27182 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Reviewed-by: Furquan Shaikh <furquan@google.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>