fix radeonfb regression with Xpress 200m 5955

Fix http://bugzilla.kernel.org/show_bug.cgi?id=9762

Framebuffer is ok only with default parameters only (it is 1280x800-8@60).  If
parameters are video=radeonfb:1280x800-32@60 then xres, yres and xres_virtual
are ok but yres_virtual is 1024.  It can be corrected by fbset utility so I
think it can be corrected in the driver code also.

Steps to reproduce: video=radeonfb:1280x800-32@60 or
video=radeonfb:1280x800-16@60

Add 1280x800 mode into modedb

Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/video/modedb.c

@@ -259,6 +259,10 @@ static const struct fb_videomode modedb[] = {
 	/* 1366x768, 60 Hz, 47.403 kHz hsync, WXGA 16:9 aspect ratio */
 	NULL, 60, 1366, 768, 13806, 120, 10, 14, 3, 32, 5,
 	0, FB_VMODE_NONINTERLACED
+   }, {
+	/* 1280x800, 60 Hz, 47.403 kHz hsync, WXGA 16:10 aspect ratio */
+	NULL, 60, 1280, 800, 12048, 200, 64, 24, 1, 136, 3,
+	0, FB_VMODE_NONINTERLACED
     },
 };