imx: imx8qxp_mek: imximage: remove config.h

config.h is not needed, remove it.
Signed-off-by: NPeng Fan <peng.fan@nxp.com>

board/freescale/imx8qxp_mek/imximage.cfg

@@ -7,7 +7,6 @@
  */
 
 #define __ASSEMBLY__
-#include <config.h>
 
 /* Boot from SD, sector size 0x400 */
 BOOT_FROM SD 0x400