futility: updater: Report EC and PD images on emulation
futility: updater: Report EC and PD images on emulation

When testing updater behavior with emulation (--emulate), there was no
way to know if EC and PD images were correctly found from archive and
expected to be flashed (for example if we want to test the difference
between modes).

Since we do flash EC/PD in recovery and factory modes, it is better
to still allow loading EC/PD images, and simply not writing them
(and print some messages as indication) in emulation.

BUG=chromium:965092
TEST=make runfutiltests
BRANCH=None

Change-Id: I3bbbd75cb8adf2e238a593d3dee0b2491abe7719
Signed-off-by: Hung-Te Lin <8a7fce4940baad93a69f5073b383c85deed9d9c4@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1626190
Legacy-Commit-Queue: Commit Bot <5c2bf027dc5cc7ef186314391646e49f6866dc00@chromium.org>
Reviewed-by: Dana Goyette <2eab2e79dc9722340b3111467dafa6c213f441d6@chromium.org>

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