tools: imx8mimage: remove redundant code

The align for fit_size has been done twice, remove the first one for it
does not make any sense.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Punit Agrawal <punit1.agrawal@toshiba.co.jp>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/tools/imx8mimage.c b/tools/imx8mimage.c
index 7defb13..bc4ee79 100644
--- a/tools/imx8mimage.c
+++ b/tools/imx8mimage.c
@@ -341,7 +341,6 @@
 	}
 
 	fit_size = fdt_totalsize(&image_header);
-	fit_size = (fit_size + 3) & ~3;
 
 	fit_size = ALIGN(fit_size, ALIGN_SIZE);