staging: fix silicom dependencies and build errors

Fix kconfig dependencies in silicom.  Fixes these build errors:

ERROR: "init_net" [drivers/staging/silicom/bypasslib/bypass.ko] undefined!
ERROR: "register_netdevice_notifier" [drivers/staging/silicom/bpctl_mod.ko] undefined!
ERROR: "unregister_netdevice_notifier" [drivers/staging/silicom/bpctl_mod.ko] undefined!
ERROR: "init_net" [drivers/staging/silicom/bpctl_mod.ko] undefined!
ERROR: "netdev_info" [drivers/net/mii.ko] undefined!
ERROR: "netif_carrier_on" [drivers/net/mii.ko] undefined!
ERROR: "netif_carrier_off" [drivers/net/mii.ko] undefined!
Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/silicom/Kconfig

@@ -19,7 +19,7 @@ if NET_VENDOR_SILICOM
 
 config SBYPASS
 	tristate "Silicom BypassCTL library support"
-	depends on PCI
+	depends on PCI && NET
 	depends on m
 	---help---
 	  If you have a network (Ethernet) controller of this type, say Y
@@ -29,7 +29,7 @@ config SBYPASS
 
 config BPCTL
 	tristate "Silicom BypassCTL net support"
-	depends on PCI
+	depends on PCI && NET
 	depends on m
 	select SBYPASS
 	select NET_CORE