fs: Move mmap callback before truncate in [file|mountpt]_operations

since mmap may exist in block_operations, but truncate may not,
moving mmap beforee truncate could make three struct more compatible

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

crypto/cryptodev.c

@@ -125,8 +125,8 @@ static const struct file_operations g_cryptofops =
   cryptof_write,       /* write  */
   NULL,                /* seek   */
   cryptof_ioctl,       /* ioctl  */
+  NULL,                /* mmap   */
   NULL,                /* truncate */
-  NULL,                /* mmap */
   cryptof_poll         /* poll   */
 };
 
@@ -138,8 +138,8 @@ static const struct file_operations g_cryptoops =
   NULL,                /* write  */
   NULL,                /* seek   */
   cryptoioctl,         /* ioctl  */
+  NULL,                /* mmap   */
   NULL,                /* truncate */
-  NULL,                /* mmap */
   NULL                 /* poll   */
 };