sb/intel/common/firmware: Use the -S flag of me_cleaner

The -S flag of me_cleaner, in addition to the standard code removal,
sets the the AltMeDisable bit (ME 6.x-10.x) or the HAP bit (ME 11.x),
which asks Intel ME to stop the execution after the hardware
initialization.

This should bring some advantages:
 * The state of Intel ME can be easily obtained by reading the Current
    Operation Mode register to trigger specific adjustments in the
    raminit (as already done in bd82x6x)
 * Intel ME falls into a more defined state, instead of being in a
    generic "Image Failure"
 * Hopefully, less code is run by Intel ME, as the execution should
    stop before even trying to load additional modules

Tested on:
 * Nehalem, Sandy Bridge and Ivy Bridge (Nicola Corna)
 * Broadwell, Skylake and Kabylake (Youness Alaoui)

If needed, the -S flag can be removed or integrated with other
board-specific options by overriding CONFIG_ME_CLEANER_ARGS.

Change-Id: I2c12d09124dcc39924d1dc4eaf53a2dc1f69a2ac
Signed-off-by: Nicola Corna <nicola@corna.info>
Reviewed-on: https://review.coreboot.org/25508
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Youness Alaoui <snifikino@gmail.com>

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