cr50_rma_open: fix linter errors
cr50_rma_open: fix linter errors

Fix errors from pylint. Use logging to print messages instead of print.

BUG=b:149405690
BRANCH=none
TEST=RMA open a device and enable testlab mode.

Change-Id: I63a8b108b0f436291659f2f787ebcf72e8f4a523
Signed-off-by: Mary Ruthven <81380f3403fed74252e92df3ed012a1819ec6296@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2052269
Reviewed-by: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@chromium.org>
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