rfkill: add header files to MAINTAINERS

These files weren't covered by the MAINTAINERS file,
add them.

Reported-by: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

MAINTAINERS

@@ -12155,6 +12155,8 @@ S:	Maintained
 F:	Documentation/rfkill.txt
 F:	Documentation/ABI/stable/sysfs-class-rfkill
 F:	net/rfkill/
+F:	include/linux/rfkill.h
+F:	include/uapi/linux/rfkill.h
 
 RHASHTABLE
 M:	Thomas Graf <tgraf@suug.ch>