Add additional MLO images to .gitignore

This rule catches images such as MLO.byteswap

Signed-off-by: Justin Waters <justin.waters@timesys.com>
diff --git a/.gitignore b/.gitignore
index 771b860..d1282e7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -24,7 +24,7 @@
 # Top-level generic files
 #
 
-/MLO
+/MLO*
 /SPL
 /System.map
 /u-boot