tools: kwboot: Update file header

Mention all supported platforms in file header.

Signed-off-by: Marek BehĂșn <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/tools/kwboot.c b/tools/kwboot.c
index 9da5b42..6fa6dff 100644
--- a/tools/kwboot.c
+++ b/tools/kwboot.c
@@ -1,6 +1,7 @@
 /*
  * Boot a Marvell SoC, with Xmodem over UART0.
- *  supports Kirkwood, Dove, Armada 370, Armada XP
+ *  supports Kirkwood, Dove, Armada 370, Armada XP, Armada 375, Armada 38x and
+ *           Armada 39x
  *
  * (c) 2012 Daniel Stodden <daniel.stodden@gmail.com>
  *