add to the list of recognized chips

Reference: /n/sources/patch/applied/vganv7600gs
Date: Tue Jun 19 22:29:52 CES 2007
Signed-off-by: anyrhine@gmail.com

--- /sys/src/cmd/aux/vga/nvidia.c	Tue Jun 19 22:29:39 2007
+++ /sys/src/cmd/aux/vga/nvidia.c	Tue Jun 19 22:29:33 2007
@@ -206,6 +206,7 @@
 		case 0x0090:
 		case 0x0210:
 		case 0x0290:	/* nvidia 7950*/
+		case 0x0390:
 			nv->arch = 40;
 			break;
 		default: