sb/intel/common/firmware: Add Intel ME/TXE firmware check

Ensure that the provided ME/TXE firmware is valid, using the
check capabilities of me_cleaner.

me_cleaner checks that the fundamental partition is available and
it has a correct signature. The checks performed by me_cleaner
aren't exhaustive, but they should find at least whether the user
has provided an empty or corrupted firmware.

me_cleaner has been tested on all the ME (6-11.6) and TXE (1-3)
firmwares available here [1], and it hasn't reported any false
positive.

[1] http://www.win-raid.com/t832f39-Intel-Engine-Firmware-Repositories.html

Change-Id: Ie6ea3b4e637dca4097b9377bd0507e84c4e8f687
Signed-off-by: Nicola Corna <nicola@corna.info>
Reviewed-on: https://review.coreboot.org/18768
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <philippe.mathieu.daude@gmail.com>

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