net: Use __kernel_clockid_t in uapi net_stamp.h

Herton reports the following error when building a userspace program that
includes net_stamp.h:

 In file included from foo.c:2:
 /usr/include/linux/net_tstamp.h:158:2: error: unknown type name
 ‘clockid_t’
   clockid_t clockid; /* reference clockid */
   ^~~~~~~~~

Fix it by using __kernel_clockid_t in place of clockid_t.

Fixes: 80b14dee ("net: Add a new socket option for a future transmit time.")
Cc: Timothy Redaelli <tredaelli@redhat.com>
Reported-by: Herton R. Krzesinski <herton@redhat.com>
Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Tested-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/uapi/linux/net_tstamp.h

@@ -155,8 +155,8 @@ enum txtime_flags {
 };
 
 struct sock_txtime {
-	clockid_t	clockid;	/* reference clockid */
-	__u32		flags;		/* as defined by enum txtime_flags */
+	__kernel_clockid_t	clockid;/* reference clockid */
+	__u32			flags;	/* as defined by enum txtime_flags */
 };
 
 #endif /* _NET_TIMESTAMPING_H */