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/intel/emeraldlake2/mainboard.c

@@ -34,7 +34,6 @@
 #include <arch/interrupt.h>
 #include <arch/coreboot_tables.h>
 #include "hda_verb.h"
-#include "chip.h"
 #include <southbridge/intel/bd82x6x/pch.h>
 
 void mainboard_suspend_resume(void)