Revert "crossystem: arm: switch to VBNV using flashrom from mosys"
Revert "crossystem: arm: switch to VBNV using flashrom from mosys"

This reverts commit 9a923c7dba003a5ddbc55937469c975689effa62.

Reason for revert: https://crbug.com/1093191

Original change's description:
> crossystem: arm: switch to VBNV using flashrom from mosys
> 
> Most ARM platforms will store VBNV in SPI flash by calling out to
> mosys, which in turn calls out to flashrom.
> 
> The set of parent CLs to this commit port this functionality from
> mosys directly to vboot's host libraries.  This CL switches to use the
> new functionality.
> 
> (The CL to switch is provided as a separate CL for ARM only so it's an
> easy and clean revert should something go wrong.)
> 
> BUG=chromium:1032351,chromium:1030473,chromium:789276
> BRANCH=none
> TEST=On scarlet, read and write VBNV using crossystem
> 
> Signed-off-by: Jack Rosenthal <jrosenth@chromium.org>
> Change-Id: I1949522b665170ebeb35f3c46177f1957980d6a3
> Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2218891
> Reviewed-by: Joel Kitching <kitching@chromium.org>

Bug: chromium:1032351, chromium:1030473, chromium:789276
Change-Id: I3ccb6c6653e24e61072ee9227e870a2f211cd114
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2237617
Reviewed-by: Shik Chen <b7ed6b6e4ace61625434ed6e50c32e94a017ccdb@chromium.org>
Commit-Queue: Shik Chen <b7ed6b6e4ace61625434ed6e50c32e94a017ccdb@chromium.org>
Commit-Queue: Stimim Chen <5413a119f383c3f4549c3ef659403f393bf06e9d@chromium.org>
Tested-by: Stimim Chen <5413a119f383c3f4549c3ef659403f393bf06e9d@chromium.org>

coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot