omap3: emif4: More clearly hard-code cs0 size

We have a single platform that is both in the OMAP3 family of parts, but
has an EMIF4 memory controller.  Currently we hard-code the size of
chip select 0.  Make this more clear by putting the value in the
function rather than a CONFIG option.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/mach-omap2/omap3/emif4.c b/arch/arm/mach-omap2/omap3/emif4.c
index d7d7798..491e7c2 100644
--- a/arch/arm/mach-omap2/omap3/emif4.c
+++ b/arch/arm/mach-omap2/omap3/emif4.c
@@ -41,7 +41,7 @@
 
 	/* TODO: Calculate the size based on EMIF4 configuration */
 	if (cs == CS0)
-		size = CONFIG_SYS_CS0_SIZE;
+		size = 256 * 1024 * 1024;
 
 	return size;
 }