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>

drivers/rc/lirc_dev.c

@@ -103,6 +103,7 @@ static const struct file_operations g_lirc_fops =
   lirc_write,  /* write */
   NULL,        /* seek */
   lirc_ioctl,  /* ioctl */
+  NULL,        /* truncate */
   lirc_poll    /* poll */
 #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
   , NULL       /* unlink */