vboot_reference/futility: Pass through SERVOD_NAME.

SERVOD_PORT and SERVOD_NAME environment variables are both used by
dut-control to identify the servod instance to use. If SERVOD_NAME is
set, query the servo serial number just like when SERVOD_PORT is set.

BUG=None
TEST=futility --servo -i with SERVOD_NAME set
BRANCH=None

Change-Id: I0c656e25d4f5da67570e3ff7d6cf28fdca5ec1cf
Signed-off-by: Sam McNally <sammc@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/3367518
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
2 files changed