Drop mainboard chip.h

mainboard_config never worked right, at least not since we've had sconfig.
Hence, drop mainboard/<vendor>/<device>/chip.h and fix up the mainboards that
tried to use it anyways.

Change-Id: I7cd403ea188d8a9fd4c1ad15479fa88e02ab8e83
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/1359
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/mainboard/ibm/e325/chip.h

@@ -1,3 +0,0 @@
-extern struct chip_operations mainboard_ops;
-
-struct mainboard_config {};

src/mainboard/ibm/e325/mainboard.c

@@ -1,5 +1,4 @@
 #include <device/device.h>
-#include "chip.h"
 
 struct chip_operations mainboard_ops = {
 	CHIP_NAME("IBM eServer 325 Mainboard")

src/mainboard/ibm/e326/chip.h

@@ -1,3 +0,0 @@
-extern struct chip_operations mainboard_ops;
-
-struct mainboard_config {};

src/mainboard/ibm/e326/mainboard.c

@@ -1,5 +1,4 @@
 #include <device/device.h>
-#include "chip.h"
 
 struct chip_operations mainboard_ops = {
 	CHIP_NAME("IBM eServer 326 Mainboard")