Add the file template for creating a new variant of Nissa.
BUG=b:229550821
Signed-off-by: Shou-Chieh Hsu <shouchieh@google.com>
Change-Id: I04f75ff91f9851b82641f703ba950b04c22e2e72
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64045
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>
Reviewed-by: Kangheui Won <khwon@chromium.org>
Shou-Chieh Hsu