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/atalk.h b/include/linux/atalk.h
index d34c187..f57c368 100644
--- a/include/linux/atalk.h
+++ b/include/linux/atalk.h
@@ -3,6 +3,7 @@
 
 #include <linux/types.h>
 #include <asm/byteorder.h>
+#include <linux/socket.h>
 
 /*
  * AppleTalk networking structures
@@ -28,7 +29,7 @@
 };
 
 struct sockaddr_at {
-	sa_family_t	  sat_family;
+	__kernel_sa_family_t sat_family;
 	__u8		  sat_port;
 	struct atalk_addr sat_addr;
 	char		  sat_zero[8];