tools: Add ifdtool to .gitignore

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/.gitignore b/tools/.gitignore
index e7f0f8f..9bc9fec 100644
--- a/tools/.gitignore
+++ b/tools/.gitignore
@@ -4,6 +4,7 @@
 /fit_check_sign
 /fit_info
 /gen_eth_addr
+/ifdtool
 /img2srec
 /kwboot
 /dumpimage