superio/*: Relocate Kconfig to chip folder.

This moves the Kconfig from the Super I/O manufacturer folder
to the chip folder instead.
This makes new chip commits self-contained unit as
edits to the central Kconfig file are no longer required.

Change-Id: I7aee07919f2ae9204850c669e0ed3cb17d4de8cd
Signed-off-by: Omar Pakker <omarpakker+coreboot@gmail.com>
Reviewed-on: https://review.coreboot.org/15973
Tested-by: build bot (Jenkins)
Reviewed-by: Idwer Vollering <vidwer@gmail.com>

src/superio/intel/i3100/Kconfig

@@ -15,6 +15,3 @@
 
 config SUPERIO_INTEL_I3100
 	bool
-
-config SUPERIO_INTEL_I8900
-	bool

src/superio/intel/i8900/Kconfig

@@ -0,0 +1,17 @@
+##
+## This file is part of the coreboot project.
+##
+## Copyright (C) 2009 Ronald G. Minnich
+##
+## This program is free software; you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation; version 2 of the License.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+
+config SUPERIO_INTEL_I8900
+	bool