RDS: Kconfig and Makefile

Add RDS Kconfig and Makefile, and modify net/'s to add
us to the build.

Signed-off-by: Andy Grover <andy.grover@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/Makefile b/net/Makefile
index 0fcce89..9e00a55 100644
--- a/net/Makefile
+++ b/net/Makefile
@@ -49,6 +49,7 @@
 endif
 obj-$(CONFIG_IP_DCCP)		+= dccp/
 obj-$(CONFIG_IP_SCTP)		+= sctp/
+obj-$(CONFIG_RDS)		+= rds/
 obj-y				+= wireless/
 obj-$(CONFIG_MAC80211)		+= mac80211/
 obj-$(CONFIG_TIPC)		+= tipc/