dt-bindings: mstar: Add Honestar SSD201_HT_V2 to mstar boards

The Honestar SSD201_HT_V2 is a full size devkit for the SigmaStar
SSD201 or SSD202D (they are pin compatible).

Currently only the SSD202D version is supported as that's the one
I have.

Signed-off-by: Daniel Palmer <daniel@0x0f.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://linux-chenxing.org/infinity2/ssd201_ht_v2/
Link: https://lore.kernel.org/r/20201201134330.3037007-4-daniel@0x0f.com

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Signed-off-by: Arnd Bergmann <arnd@arndb.de>