alsa-state: Add bluetooth audio default headset and speaker devices

This commit adds virtual PCM devices which are used for HSP/HFP and A2DP
profiles.

Signed-off-by: Alex Gonzalez <alex.gonzalez@digi.com>

meta-digi-arm/recipes-bsp/alsa-state/alsa-state/3.10/ccimx6/asound.conf

@@ -0,0 +1,43 @@
+pcm.btheadset {
+    type plug
+    slave {
+        pcm {
+            type bluetooth
+            device 80:57:19:B2:A1:04
+            profile "auto"
+        }
+    }
+    hint {
+        show on
+        description "BT Headset"
+    }
+}
+ctl.btheadset {
+  type bluetooth
+}
+
+pcm.btspeaker {
+    type plug
+    slave {
+        pcm {
+            type bluetooth
+            device A0:E9:DB:10:33:58
+            profile "auto"
+        }
+    }
+    hint {
+        show on
+        description "BT Speaker"
+    }
+}
+ctl.btspeaker {
+  type bluetooth
+}
+
+pcm.btspeaker_softvol
+{
+   type softvol
+   slave.pcm "btspeaker"
+   control.name "Bluetooth"
+   control.card 0
+}