[media] m5mols: Add missing #include <linux/sizes.h>

Include <linux/sizes.h> header that is missing after commit ab7ef224
"[media] m5mols: Implement .get_frame_desc subdev callback".
It prevents possible build errors due to undefined SZ_1M.

This header is currently included only when m5mols is compiled
on arm; if build on other archs, the compilation will break.
Reported-by: NJan Hoogenraad <jan-conceptronic@hoogenraad.net>
Signed-off-by: NSylwester Nawrocki <sylvester.nawrocki@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/i2c/m5mols/m5mols.h

@@ -16,6 +16,7 @@
 #ifndef M5MOLS_H
 #define M5MOLS_H
 
+#include <linux/sizes.h>
 #include <media/v4l2-subdev.h>
 #include "m5mols_reg.h"