Add the support for RDC R8610 Northbridge

So far the it just setups the internal resource management for coreboot and
detects the memory size.

Change-Id: I8506390fa6656abfa40d92b8f6ede9b91fe98680
Signed-off-by: Rudolf Marek <r.marek@assembler.cz>
Reviewed-on: http://review.coreboot.org/807
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
diff --git a/src/northbridge/Makefile.inc b/src/northbridge/Makefile.inc
index 57273cf..283ba4e 100644
--- a/src/northbridge/Makefile.inc
+++ b/src/northbridge/Makefile.inc
@@ -1,3 +1,4 @@
 subdirs-y += amd
 subdirs-y += intel
+subdirs-y += rdc
 subdirs-y += via