ALSA: ac97 - Add patch entry for Conexant CX20468-31 chip

Added the patch entry for Conexant CX20468-31 chip (4358:5430).

Reference: Novell bnc#471265
	https://bugzilla.novell.com/show_bug.cgi?id=471265Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/ac97/ac97_codec.c

@@ -143,6 +143,7 @@ static const struct ac97_codec_id snd_ac97_codec_ids[] = {
 { 0x43525970, 0xfffffff8, "CS4202",		NULL,		NULL },
 { 0x43585421, 0xffffffff, "HSD11246",		NULL,		NULL },	// SmartMC II
 { 0x43585428, 0xfffffff8, "Cx20468",		patch_conexant,	NULL }, // SmartAMC fixme: the mask might be different
+{ 0x43585430, 0xffffffff, "Cx20468-31",		patch_conexant, NULL },
 { 0x43585431, 0xffffffff, "Cx20551",           patch_cx20551,  NULL },
 { 0x44543031, 0xfffffff0, "DT0398",		NULL,		NULL },
 { 0x454d4328, 0xffffffff, "EM28028",		NULL,		NULL },  // same as TR28028?