ALSA: hda - allow up to 4 HDMI devices

The new Intel HDMI codec supports 2 independant HDMI/DisplayPort pipes.
We'll be exporting them as 2 pcm devices. So bump up the allowed number
of HDMI devices.
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/hda_codec.c

@@ -2889,7 +2889,7 @@ static int get_empty_pcm_device(struct hda_bus *bus, int type)
 	static int audio_idx[HDA_PCM_NTYPES][5] = {
 		[HDA_PCM_TYPE_AUDIO] = { 0, 2, 4, 5, -1 },
 		[HDA_PCM_TYPE_SPDIF] = { 1, -1 },
-		[HDA_PCM_TYPE_HDMI]  = { 3, -1 },
+		[HDA_PCM_TYPE_HDMI]  = { 3, 7, 8, 9, -1 },
 		[HDA_PCM_TYPE_MODEM] = { 6, -1 },
 	};
 	int i;