headers, net: Use __kernel_sa_family_t in more definitions shared with userland

Complete the work started with commit
6602a4baf4d1a73cc4685a39ef859e1c5ddf654c ('net: Make userland include
of netlink.h more sane').

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index 180540a..8180cd9 100644
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -1,7 +1,7 @@
 #ifndef __LINUX_NETLINK_H
 #define __LINUX_NETLINK_H
 
-#include <linux/socket.h> /* for sa_family_t */
+#include <linux/socket.h> /* for __kernel_sa_family_t */
 #include <linux/types.h>
 
 #define NETLINK_ROUTE		0	/* Routing/device hook				*/