Change FIOC_MMAP into file operation call

- Add mmap into file_operations and remove it from ioctl definitions.
- Add mm_map structure definitions to support future unmapping
- Modify all drivers to initialize the operations struct accordingly

Signed-off-by: Jukka Laitinen <jukkax@ssrc.tii.ae>

drivers/bch/bchdev_driver.c

@@ -79,6 +79,7 @@ const struct file_operations bch_fops =
   bch_seek,    /* seek */
   bch_ioctl,   /* ioctl */
   NULL,        /* truncate */
+  NULL,        /* mmap */
   bch_poll     /* poll */
 #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
   , bch_unlink /* unlink */