sb/intel/common: Create a common PCH finalise implementation

The common finalise code is used by bd82x6x, Lynx Point, and Ibex Peak.

Lynx Point now benefits from being able to write-protect the flash chip.

For Lynx Point, writing the SPI OPMENU now happens in ramstage, as done
in bd82x6x.

Tested on an ASRock H81M-HDS (Lynx Point). When write-protection is
configured, flashrom reports all flash regions as read-only, and does
not manage to alter the contents of the flash chip.

Also tested on an ASUS P8H61-M LX (Cougar Point). Everything seems to
work as before.

Change-Id: I781082b1ed507b00815d1e85aec3e56ae5a4bef2
Signed-off-by: Tristan Corrick <tristan@corrick.kiwi>
Reviewed-on: https://review.coreboot.org/c/29977
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

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