roms: Added git submodule for u-boot-sam460 (firmware for sam460ex)

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
diff --git a/.gitmodules b/.gitmodules
index 7a8282d..b76fb45 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -43,3 +43,6 @@
 [submodule "roms/seabios-hppa"]
 	path = roms/seabios-hppa
 	url = git://github.com/hdeller/seabios-hppa.git
+[submodule "roms/u-boot-sam460ex"]
+	path = roms/u-boot-sam460ex
+	url = git://github.com/zbalaton/u-boot-sam460ex