tifm: add missing include for DMA_32BIT_MASK

sparc64:

drivers/misc/tifm_7xx1.c: In function `tifm_7xx1_probe':
drivers/misc/tifm_7xx1.c:294: error: `DMA_32BIT_MASK' undeclared

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

drivers/misc/tifm_7xx1.c

@@ -10,6 +10,7 @@
  */
 
 #include <linux/tifm.h>
+#include <linux/dma-mapping.h>
 
 #define DRIVER_NAME "tifm_7xx1"
 #define DRIVER_VERSION "0.8"