[ALSA] Update documentation for ice1712 and ice1724

Documentation,ICE1712 driver
Updated the documentation for ice1712 and ice1724 drivers.
Added the device description for shuttle SN25P missing in the last patch.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/ice1712/vt1720_mobo.h b/sound/pci/ice1712/vt1720_mobo.h
index e0b613c..0b1b0ee 100644
--- a/sound/pci/ice1712/vt1720_mobo.h
+++ b/sound/pci/ice1712/vt1720_mobo.h
@@ -27,7 +27,8 @@
 #define VT1720_MOBO_DEVICE_DESC        "{Albatron,K8X800 Pro II},"\
 				       "{Chaintech,ZNF3-150},"\
 				       "{Chaintech,ZNF3-250},"\
-				       "{Chaintech,9CJS},"
+				       "{Chaintech,9CJS},"\
+				       "{Shuttle,SN25P},"
 
 #define VT1720_SUBDEVICE_K8X800		0xf217052c
 #define VT1720_SUBDEVICE_ZNF3_150	0x0f2741f6