MAINTAINERS: Add net_tstamp.h to SOCKET TIMESTAMPING section

This is part of an effort to assign a section in MAINTAINERS to header
files that relate to Networking. In this case the files with "net" in
their name.

Cc: Richard Cochran <[email protected]>
Cc: Willem de Bruijn <[email protected]>
Signed-off-by: Simon Horman <[email protected]>
Acked-by: Willem de Bruijn <[email protected]>
Signed-off-by: Paolo Abeni <[email protected]>

Author: horms

MAINTAINERS

@@ -21057,6 +21057,7 @@ SOCKET TIMESTAMPING
 M:	Willem de Bruijn <[email protected]>
 S:	Maintained
 F:	Documentation/networking/timestamping.rst
+F:	include/linux/net_tstamp.h
 F:	include/uapi/linux/net_tstamp.h
 F:	tools/testing/selftests/net/so_txtime.c