tools: add support for Marvell doimage

Add Marvell "doimage" utility support.
The "doimage" utility allows to create flash images compatible
with Marvell BootROM image format. Additionally this tool
allows the flash image parsing and verification.

Change-Id: Ie8d7ccd0cc2978684e7eecb695f375395fc749ee
Signed-off-by: Konstantin Porotchkin <kostap@marvell.com>
diff --git a/.gitignore b/.gitignore
index 4ece189..7f8642e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,6 +18,7 @@
 tools/cert_create/src/**/*.o
 tools/cert_create/cert_create
 tools/cert_create/cert_create.exe
+tools/doimage/doimage
 
 # GNU GLOBAL files
 GPATH