net: Enable compilation of net_if.c

Change-Id: Icae9d7222b7b41539ff6e4e7d3c8916c5a3ec5f5
Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>

net/yaip/Makefile

@@ -1,3 +1,4 @@
 ccflags-y += -I${srctree}/net/ip
 obj-y = net_core.o \
+	net_if.o \
 	nbuf.o

net/yaip/net_core.c

@@ -96,6 +96,8 @@ static int net_init(struct device *unused)
 
 	init_rx_queue();
 
+	net_if_init();
+
 	return network_initialization();
 }
 

net/yaip/net_private.h

@@ -23,3 +23,4 @@
 #include <errno.h>
 
 extern void net_nbuf_init(void);
+extern int net_if_init(void);