mb/google/dedede: Create storo variant

mb/google/dedede: Create storo variant

Create the storo 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 4.3.1).

BUG=b:174284884
BRANCH=None
TEST=util/abuild/abuild -p none -t google/dedede -x -a
make sure the build includes GOOGLE_STORO

Signed-off-by: Tao Xia <xiatao5@huaqin.corp-partner.google.com>
Change-Id: I5ad41e0b2bc95b44733a2ad3c543267f3f56f9e7
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48227
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Xuxin Xiong <xuxinxiong@huaqin.corp-partner.google.com>
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>