malta: setup super I/O UARTs

On a real Malta the Super I/O needs to be configured before we are able
to access the UARTs. This patch performs that configuration, setting up
the UARTs in the same way that YAMON would.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
diff --git a/board/imgtec/malta/Makefile b/board/imgtec/malta/Makefile
index 091830d..19dd3a3 100644
--- a/board/imgtec/malta/Makefile
+++ b/board/imgtec/malta/Makefile
@@ -7,3 +7,4 @@
 
 obj-y	= malta.o
 obj-y	+= lowlevel_init.o
+obj-y	+= superio.o