Report GSE chipset and warn if the code has been compiled for the wrong chipset.

Report GSE chipset and warn if the code has been compiled for the wrong chipset.

It would be nicer to unify the code so that it does all detection at runtime
instead of compile time (but that would also significantly increase code size)
so if someone else wants to give it a shot...

Change-Id: Idc67bdf7a6ff2b78dc8fc67a0da5ae7a4c0a3bf0
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/184
Tested-by: build bot (Jenkins)