new_variant_fulltest: remove remnants of volteer

The 'volteer' reference board is no longer supported. The test
script already rejects 'volteer' as an option, but there is some
code to check for 'volteer' that should also be removed.

BUG=None
TEST=None

Change-Id: I1b5d212c42685162335bcd59922b6c433b1405c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/3258090
Tested-by: Paul Fagerburg <pfagerburg@chromium.org>
Auto-Submit: Paul Fagerburg <pfagerburg@chromium.org>
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
Commit-Queue: Jack Rosenthal <jrosenth@chromium.org>
1 file changed