dt-bindings: arm: mstar: Add compatible for 100ask DongShanPiOne

The DongShanPiOne is a SigmaStar SSD202D based module.
Add a compatible for it to the list of infinity2m boards.

Link: http://linux-chenxing.org/infinity2/dongshanpione/


Signed-off-by: Daniel Palmer <daniel@0x0f.com>
Acked-by: Rob Herring <robh@kernel.org>