af_iucv: add sockopt() to enable/disable use of IPRM_DATA msgs

Provide the socket operations getsocktopt() and setsockopt() to enable/disable
sending of data in the parameter list of IUCV messages.
The patch sets respective flag only.

Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/socket.h b/include/linux/socket.h
index 42a0396..d2310cb 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -303,6 +303,7 @@
 #define SOL_BLUETOOTH	274
 #define SOL_PNPIPE	275
 #define SOL_RDS		276
+#define SOL_IUCV	277
 
 /* IPX options */
 #define IPX_TYPE	1