[Blackfin] arch: fix bug add missing header file

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

arch/blackfin/mach-bf548/dma.c

@@ -27,6 +27,8 @@
  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
+#include <linux/module.h>
+
 #include <asm/blackfin.h>
 #include <asm/dma.h>