iucv: kernel option for z/VM IUCV and HiperSockets

When adding HiperSockets transport to AF_IUCV Sockets, af_iucv either
depends on IUCV or QETH_L3 (or both). This patch introduces the
necessary changes for kernel configuration.
Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/iucv/Kconfig

 config IUCV
-	tristate "IUCV support (S390 - z/VM only)"
 	depends on S390
+	def_tristate y if S390
+	prompt "IUCV support (S390 - z/VM only)"
 	help
 	  Select this option if you want to use inter-user communication
 	  under VM or VIF. If you run on z/VM, say "Y" to enable a fast
 	  communication link between VM guests.
 
 config AFIUCV
-	tristate "AF_IUCV support (S390 - z/VM only)"
-	depends on IUCV
+	depends on S390
+	def_tristate m if QETH_L3 || IUCV
+	prompt "AF_IUCV Socket support (S390 - z/VM and HiperSockets transport)"
 	help
-	  Select this option if you want to use inter-user communication under
-	  VM or VIF sockets. If you run on z/VM, say "Y" to enable a fast
-	  communication link between VM guests.
+	  Select this option if you want to use AF_IUCV socket applications
+	  based on z/VM inter-user communication vehicle or based on
+	  HiperSockets.