Add vid/did for VIA vt8237 southbridge.

Reference: /n/sources/patch/applied/southbridge-vt8237
Date: Fri Jun  3 10:05:22 CES 2005

--- /sys/src/9/pc/pci.c	Fri Jun  3 10:04:56 2005
+++ /sys/src/9/pc/pci.c	Fri Jun  3 10:04:52 2005
@@ -640,6 +640,7 @@
 	{ 0x1106, 0x0586, viaget, viaset },	// Viatech 82C586
 	{ 0x1106, 0x0596, viaget, viaset },	// Viatech 82C596
 	{ 0x1106, 0x0686, viaget, viaset },	// Viatech 82C686
+	{ 0x1106, 0x3227, viaget, viaset },	// Viatech VT8237
 	{ 0x1045, 0xc700, optiget, optiset },	// Opti 82C700
 	{ 0x10b9, 0x1533, aliget, aliset },	// Al M1533
 	{ 0x1039, 0x0008, pIIxget, pIIxset },	// SI 503