mb/google/volteer: Create todor variant

mb/google/volteer: Create todor variant

Create the todor variant of the volteer reference board by copying
the template files to a new directory named for the variant.

(Auto-Generated by create_coreboot_variant.sh version 4.1.1).

In addition,
  * sort the variant names in alphabetical order.
  * todor uses the same config options as terrador.

BUG=b:162110806
BRANCH=None
TEST=util/abuild/abuild -p none -t google/volteer -x -a
make sure the build includes GOOGLE_TODOR

Signed-off-by: YH Lin <yueherngl@google.com>
Change-Id: I7aa7acf1f3c3cc14b92ded05d5868818a627a432
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43838
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Caveh Jalali <caveh@chromium.org>