rockchip: RK3288 needs fdt and initrd below 256M now

I am not sure why this limit is changing. But my kernel
doesn't load when it's above 256. This was testing on the
rock2 board.

Signed-off-by: Sandy Patterson <apatterson@sightlogix.com>
Updated commit subject:
Signed-off-by: Simon Glass <sjg@chromium.org>

include/configs/rk3288_common.h

@@ -114,11 +114,11 @@
 
 #include <config_distro_bootcmd.h>
 
-/* Linux fails to load the fdt if it's loaded above 512M on a Rock 2 board, so
+/* Linux fails to load the fdt if it's loaded above 256M on a Rock 2 board, so
  * limit the fdt reallocation to that */
 #define CONFIG_EXTRA_ENV_SETTINGS \
-	"fdt_high=0x1fffffff\0" \
-	"initrd_high=0x1fffffff\0" \
+	"fdt_high=0x0fffffff\0" \
+	"initrd_high=0x0fffffff\0" \
 	"partitions=" PARTS_DEFAULT \
 	ENV_MEM_LAYOUT_SETTINGS \
 	ROCKCHIP_DEVICE_SETTINGS \