omap4_panda: Ignore omap4 SPL called MLO

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Cc: Joe Hershberger <joe.hershberger@gmail.com>
Cc: Sandeep Paulraj <s-paulraj@ti.com>

.gitignore

@@ -19,6 +19,7 @@
 # Top-level generic files
 #
 
+/MLO
 /System.map
 /u-boot
 /u-boot.hex