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/ax25.h b/include/linux/ax25.h
index 56c11f0..74c89a4 100644
--- a/include/linux/ax25.h
+++ b/include/linux/ax25.h
@@ -47,7 +47,7 @@
 } ax25_address;
 
 struct sockaddr_ax25 {
-	sa_family_t	sax25_family;
+	__kernel_sa_family_t sax25_family;
 	ax25_address	sax25_call;
 	int		sax25_ndigis;
 	/* Digipeater ax25_address sets follow */