Add ftruncate into file operation calls

- Add truncate into file_operations
- Move truncate to be common for mountpt_operations and file_operations
- Modify all drivers to initialize the operations struct accordingly

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

crypto/cryptodev.c

@@ -125,6 +125,7 @@ static const struct file_operations g_cryptofops =
   cryptof_write,       /* write  */
   NULL,                /* seek   */
   cryptof_ioctl,       /* ioctl  */
+  NULL,                /* truncate */
   cryptof_poll         /* poll   */
 };
 
@@ -136,6 +137,7 @@ static const struct file_operations g_cryptoops =
   NULL,                /* write  */
   NULL,                /* seek   */
   cryptoioctl,         /* ioctl  */
+  NULL,                /* truncate */
   NULL                 /* poll   */
 };