iMX28: Add image header generator tool

This tool can now generate proper image for "BootStream" files.

NOTE: This tool now works only for NAND.

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Detlev Zundel <dzu@denx.de>
diff --git a/tools/.gitignore b/tools/.gitignore
index 07f21a3..98a5c78 100644
--- a/tools/.gitignore
+++ b/tools/.gitignore
@@ -4,6 +4,7 @@
 /img2srec
 /mkimage
 /mpc86x_clk
+/mxsboot
 /ncb
 /ncp
 /ubsha1