ARM: SMDK6410: Make virtual screen twice depth of real

For situations where double buffering is needed (such as the
current Android) make the screen virtual y size twice the
LCD size so that there is space for a second screen that
can be switched to.
Signed-off-by: NBen Dooks <ben-linux@fluff.org>

arch/arm/mach-s3c64xx/mach-smdk6410.c

@@ -153,6 +153,8 @@ static struct s3c_fb_pd_win smdk6410_fb_win0 = {
 	},
 	.max_bpp	= 32,
 	.default_bpp	= 16,
+	.virtual_y	= 480 * 2,
+	.virtual_x	= 800,
 };
 
 /* 405566 clocks per frame => 60Hz refresh requires 24333960Hz clock */