[i2s_audio] Move test bus into a shared package and give fixtures unique ids (#16793)

tests/components/router/common.yaml

@@ -8,13 +8,10 @@ esphome:
       - router.speaker.switch_output:
           target_speaker: !lambda return id(speaker_a_id);
 
-i2s_audio:
-  i2s_lrclk_pin: ${a_lrclk_pin}
-  i2s_bclk_pin: ${a_bclk_pin}
-
 speaker:
   - platform: i2s_audio
     id: speaker_a_id
+    i2s_audio_id: i2s_audio_bus
     dac_type: external
     i2s_dout_pin: ${a_dout_pin}
     sample_rate: 48000
@@ -22,6 +19,7 @@ speaker:
     channel: stereo
   - platform: i2s_audio
     id: speaker_b_id
+    i2s_audio_id: i2s_audio_bus
     dac_type: external
     i2s_dout_pin: ${b_dout_pin}
     spdif_mode: true

tests/components/router/test.esp32-idf.yaml

@@ -1,7 +1,8 @@
 substitutions:
-  a_lrclk_pin: GPIO4
-  a_bclk_pin: GPIO5
-  a_dout_pin: GPIO14
-  b_dout_pin: GPIO19
+  a_dout_pin: GPIO26
+  b_dout_pin: GPIO27
+
+packages:
+  i2s_audio: !include ../../test_build_components/common/i2s_audio/esp32-idf.yaml
 
 <<: !include common.yaml