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

Complete the work started with commit
6602a4baf4 ('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>

include/linux/caif/caif_socket.h

@@ -9,12 +9,7 @@
 #define _LINUX_CAIF_SOCKET_H
 
 #include <linux/types.h>
-
-#ifdef __KERNEL__
 #include <linux/socket.h>
-#else
-#include <sys/socket.h>
-#endif
 
 /**
  * enum caif_link_selector -    Physical Link Selection.
@@ -144,7 +139,7 @@ enum caif_debug_service {
  * CAIF Channel. It defines the service to connect to on the modem.
  */
 struct sockaddr_caif {
-	sa_family_t  family;
+	__kernel_sa_family_t  family;
 	union {
 		struct {
 			__u8  type;		/* type: enum caif_at_type */