[ALSA] Use old default id strings for compatibility

EMU10K1/EMU10K2 driver
Use expliciitly the old default id strings for backward compatibility.
This will make 'alsactl restore' working again.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/include/sound/emu10k1.h b/include/sound/emu10k1.h
index b1e8ee8..66479197 100644
--- a/include/sound/emu10k1.h
+++ b/include/sound/emu10k1.h
@@ -1050,8 +1050,9 @@
 	unsigned char spdif_bug;    /* Has Spdif phasing bug */
 	unsigned char ac97_chip;    /* Has an AC97 chip */
 	unsigned char ecard;        /* APS EEPROM */
-	char * driver;
-	char * name;
+	const char *driver;
+	const char *name;
+	const char *id;		/* for backward compatibility - can be NULL if not needed */
 } emu_chip_details_t;
 
 struct _snd_emu10k1 {