vboot_ref: Reshuffle parallel flashrom impl

Bring sub-process and libflashrom wrapper implementations
under the common host/lib path to later be reconciled.
The WP implementation is left separated out due to the
lack of a libflashrom WP implementation which creates
circular dependencies for the moment.

BUG=b:207808292
BRANCH=none
TEST=none

Signed-off-by: Edward O'Callaghan <quasisec@google.com>
Change-Id: Ic759c4e9828778a0ef1443b163224aef2c7cba54
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/3461093
Reviewed-by: Nikolai Artemiev <nartemiev@google.com>
Auto-Submit: Edward O'Callaghan <quasisec@chromium.org>
Tested-by: Edward O'Callaghan <quasisec@chromium.org>
Commit-Queue: Edward O'Callaghan <quasisec@chromium.org>
5 files changed