Add PCM "hdmi"

Added the new PCM "hdmi" for HDA-Intel.
It's still experimental.

src/conf/cards/HDA-Intel.conf

@@ -137,6 +137,51 @@ HDA-Intel.pcm.iec958.0 {
 	hint.device 1
 }
 
+<confdir:pcm/hdmi.conf>
+
+HDA-Intel.pcm.hdmi.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
+		device 3
+	}
+	hooks.0 {
+		type ctl_elems
+		hook_args [
+		{
+			name "IEC958 Playback Default"
+			lock true
+			preserve true
+			value [ $AES0 $AES1 $AES2 $AES3 ]
+		}
+		{
+			name "IEC958 Playback Switch"
+			lock true
+			preserve true
+			value true
+		}
+		]
+	}
+	hint.device 3
+}
+
 <confdir:pcm/modem.conf>
 
 HDA-Intel.pcm.modem.0 {