tools: kwbimage: Remove comment about unimplemented register headers in v1 images

Support for register headers in v1 images was implemented in commit
02ba70ad6822 ("tools: kwbimage: Add support for DATA command also for v1
images"). So remove old comment.

Signed-off-by: Pali Rohár <pali@kernel.org>
Fixes: 02ba70ad6822 ("tools: kwbimage: Add support for DATA command also for v1 images")
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/tools/kwbimage.c b/tools/kwbimage.c
index aa865cc..d200ff2 100644
--- a/tools/kwbimage.c
+++ b/tools/kwbimage.c
@@ -5,8 +5,6 @@
  *
  * (C) Copyright 2013 Thomas Petazzoni
  * <thomas.petazzoni@free-electrons.com>
- *
- * Not implemented: support for the register headers in v1 images
  */
 
 #include "imagetool.h"