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/Kconfig b/net/Kconfig
index a12bae0..6b39ede 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -171,6 +171,7 @@
 
 source "net/dccp/Kconfig"
 source "net/sctp/Kconfig"
+source "net/rds/Kconfig"
 source "net/tipc/Kconfig"
 source "net/atm/Kconfig"
 source "net/802/Kconfig"