cr50_rma_open: raise an error if cr50 is too old
cr50_rma_open: raise an error if cr50 is too old

At this point images with testlab support are available. Fail if cr50 is
running a prod image that is too old.

BUG=none
BRANCH=none
TEST=none

Change-Id: I096502417c4a44b4a2f458a2a5601de2d154d5cf
Signed-off-by: Mary Ruthven <81380f3403fed74252e92df3ed012a1819ec6296@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2207572
Reviewed-by: Wai-Hong Tam <04b587fdf5845741a0c5a8b9cd59ca72d73ef8fc@google.com>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec