aux/vga: eepc igfx support (thanks p.kosyh)

This patch to makes 1024x600x32 work. Without it
only 800x600 is supported.

To load this mode, run:

	aux/vga -m eeepc -l 1024x600x32

lib/vgadb

@@ -442,6 +442,7 @@ ctlr
 	ctlr=igfx linear=1
 
 ctlr
+	vid=0x8086 did=0xa011   # PineView Graphics
 	vid=0x8086 did=0x2592	# Intel 915GM
 	vid=0x8086 did=0x27a2	# Intel GM945/82940GML (hardware cursor broken)
 	vid=0x8086 did=0x2a02	# Intel GM965/GL960/X3100 (hardware cursor broken)
@@ -484,6 +485,7 @@ ctlr
 # An attribute 'alias=val' means continue using another monitor type. It can
 # be used to chain classes together. (bad explanation, i know).
 #
+
 include=640x480					# 60Hz, 31.5KHz
 	clock=25.175
 	shb=664 ehb=760 ht=800
@@ -1854,3 +1856,10 @@ t43p=1600x1200
 	shb=1664 ehb=1856 ht=2160
 	vrs=1201 vre=1204 vt=1250
 	hsync=+ vsync=+
+
+eeepc=1024x600
+	clock=54.2
+	shb=1048 ehb=1184 ht=1344
+	vrs=603 vre=609 vt=670
+	hsync=- vsync=-
+	lcd=1

sys/src/cmd/aux/vga/igfx.c

@@ -375,6 +375,7 @@ devtype(Igfx *igfx)
 	case 0x0102:	/* Dell Optiplex 790 */
 	case 0x0126:	/* Thinkpad X220 */
 		return TypeSNB;
+	case 0xa011:    /* PineView Graphics */
 	case 0x27a2:	/* GM945/82940GML - ThinkPad X60 Tablet */
 	case 0x29a2:	/* 82P965/G965 HECI desktop */
 	case 0x2a02:	/* GM965/GL960/X3100 - ThinkPad X61 Tablet */