mx7: remove empty ifndef statement

Signed-off-by: Peter Robinson <pbrobinson@gmail.com>

include/configs/mx7_common.h

@@ -36,9 +36,6 @@
 #define CONFIG_SYS_CBSIZE		512
 #define CONFIG_SYS_MAXARGS		32
 
-#ifndef CONFIG_SYS_DCACHE_OFF
-#endif
-
 /* UART */
 #define CONFIG_MXC_UART