mb/google/dedede: Create boxy variant

mb/google/dedede: Create boxy variant

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

(Auto-Generated by create_coreboot_variant.sh version 4.5.0).

BUG=b:277529068
BRANCH=None
TEST=util/abuild/abuild -p none -t google/dedede -x -a
make sure the build includes GOOGLE_BOXY

Change-ID: Ief22eb000421c23abf6de3f99eb860bdae1e7919
Signed-off-by: kevin3.yang <kevin3.yang@lcfc.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74536
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Derek Huang <derekhuang@google.com>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>