test-case/check-alsabat.sh: Select the first card for amixer contents

Amixer, by default, looks for the first card, and in Amixer's view, the first card is always numbered 0.  
In the SoundWire configuration, card 0 is configured with sof-probe, and card 1 is configured with the actual sound card.  
Hence, we are assigning it accordingly.
Fixes: #1265

Signed-off-by: Hariprasad, Rajendra <hariprasad.rajendra@intel.com>

Author: harajend

test-case/check-alsabat.sh

@@ -124,7 +124,7 @@ alsabat -P$pcm_p --standalone -n $frames -c $channel_p -r $rate -f $format -F $f
 sleep 1
 
 # Select the first card
-first_card_name=$(aplay -l | awk 'NR == 2 {print $3}')
+first_card_name=$(aplay -l | awk '/^card ([0-9]+)/ {print $3; exit}')
 # dump amixer contents always.
 # Good case amixer settings is for reference, bad case for debugging.
 amixer -c "${first_card_name}" contents > "$LOG_ROOT"/amixer_settings.txt