kconfig: drop intermittend forwarder files

With kconfig understanding wildcards, we don't need
Kconfig files that just include other Kconfig files
anymore.

Change-Id: I7584e675f78fcb4ff1fdb0731e340533c5bc040d
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: http://review.coreboot.org/9298
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/superio/smsc/Kconfig

@@ -18,6 +18,9 @@
 ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 ##
 
+config SUPERIO_WANTS_14MHZ_CLOCK
+	bool
+
 config SUPERIO_SMSC_FDC37M60X
 	bool
 config SUPERIO_SMSC_FDC37N972