[ALSA] emu10k1 - Fix loading of SBLive Game board

EMU10K1/EMU10K2 driver
Fixed the error at loading SBLive Game board (and possible other models).
The PCI SSIDs of this board conflicts with SB Live 5.1 Platinum, which has
no AC97 chip.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/include/sound/emu10k1.h b/include/sound/emu10k1.h
index 67bf3f1..14cb271 100644
--- a/include/sound/emu10k1.h
+++ b/include/sound/emu10k1.h
@@ -1059,7 +1059,7 @@
 	unsigned char spk71;        /* Has 7.1 speakers */
 	unsigned char sblive51;	    /* SBLive! 5.1 - extout 0x11 -> center, 0x12 -> lfe */
 	unsigned char spdif_bug;    /* Has Spdif phasing bug */
-	unsigned char ac97_chip;    /* Has an AC97 chip */
+	unsigned char ac97_chip;    /* Has an AC97 chip: 1 = mandatory, 2 = optional */
 	unsigned char ecard;        /* APS EEPROM */
 	const char *driver;
 	const char *name;