sys/dev/cfi: include sys/types.h as well

This will soon be a dependency for machine/atomic.h on mips with the
introduction of 64-bit atomics; the scope here is pretty narrow, so throw it
here in the header just before systm.h, which includes machine/atomic.h

sys/dev/cfe/cfe_api.h

@@ -63,6 +63,7 @@
  * CFE_API_* can be defined here as desired.
  */
 /* Begin customization. */
+#include <sys/types.h>
 #include <sys/stdint.h>		/* All of the typedefs.  */
 #include <sys/systm.h>		/* strlen() prototype.  */