Add iec958 PCM definition for PS3

Added the iec958 PCM definition for PS3.
Since it's a new feature, the definition is marked as optional.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

src/conf/cards/PS3.conf

@@ -44,3 +44,42 @@ PS3.pcm.default {
 		}
 	}
 }
+
+<confdir:pcm/iec958.conf>
+
+PS3.pcm.iec958.0 {
+	@args [ CARD AES0 AES1 AES2 AES3 ]
+	@args.CARD {
+		type string
+	}
+	@args.AES0 {
+		type integer
+	}
+	@args.AES1 {
+		type integer
+	}
+	@args.AES2 {
+		type integer
+	}
+	@args.AES3 {
+		type integer
+	}
+	type hooks
+	slave.pcm {
+		type hw
+		card $CARD
+	}
+	hooks.0 {
+		type ctl_elems
+		hook_args [
+			{
+				interface PCM
+				name "IEC958 Playback Default"
+				lock true
+				preserve true
+				optional true
+				value [ $AES0 $AES1 $AES2 $AES3 ]
+			}
+		]
+	}
+}