Add the file templates for creating a new variant of Brask.
BUG=b:215091592
TEST=new_variant.py and build coreboot pass for the new variant.
Change-Id: I67e4ed450d6033fed7419bd7c76c127ecd942fe8
Signed-off-by: Zhuohao Lee <zhuohao@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61184
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Zhuohao Lee