gitignore: ignore atmel pmecc parameter tool

Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
diff --git a/tools/.gitignore b/tools/.gitignore
index cefe923..e7f0f8f 100644
--- a/tools/.gitignore
+++ b/tools/.gitignore
@@ -1,3 +1,4 @@
+/atmel_pmecc_params
 /bmp_logo
 /envcrc
 /fit_check_sign