[ALSA] Check revision for the proper detection of audigy 2

EMU10K1/EMU10K2 driver
Check ther revision to detect non-listed audigy 2 boards.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/include/sound/emu10k1.h b/include/sound/emu10k1.h
index 6647919..f5babd3 100644
--- a/include/sound/emu10k1.h
+++ b/include/sound/emu10k1.h
@@ -1040,6 +1040,7 @@
 	u32 vendor;
 	u32 device;
 	u32 subsystem;
+	unsigned char revision;
 	unsigned char emu10k1_chip; /* Original SB Live. Not SB Live 24bit. */
 	unsigned char emu10k2_chip; /* Audigy 1 or Audigy 2. */
 	unsigned char ca0102_chip;  /* Audigy 1 or Audigy 2. Not SB Audigy 2 Value. */