ALSA: ctxfi - Allow unknown PCI SSIDs

Allow unknown PCI SSIDs for emu20k1 and emu20k2 as "unknown" model.
Also, add a black-list check in case any device has to be listed
as "unsupported".  It has a negative value in the pci quirk entry.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/ctxfi/cthardware.h b/sound/pci/ctxfi/cthardware.h
index 4a8e04f..a4c2cad 100644
--- a/sound/pci/ctxfi/cthardware.h
+++ b/sound/pci/ctxfi/cthardware.h
@@ -30,13 +30,16 @@
 enum CTCARDS {
 	/* 20k1 models */
 	CTSB055X,
+	CT20K1_MODEL_FIRST = CTSB055X,
 	CTSB073X,
 	CTUAA,
 	CT20K1_UNKNOWN,
 	/* 20k2 models */
 	CTSB0760,
+	CT20K2_MODEL_FIRST = CTSB0760,
 	CTHENDRIX,
 	CTSB0880,
+	CT20K2_UNKNOWN,
 	NUM_CTCARDS		/* This should always be the last */
 };