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/sensors/scd41.c

@@ -190,6 +190,7 @@ static const struct file_operations g_scd41fops =
   scd41_write,    /* write */
   NULL,           /* seek */
   scd41_ioctl,    /* ioctl */
+  NULL,           /* truncate */
   NULL            /* poll */
 #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
   , scd41_unlink /* unlink */