dt-bindings: Add vendor prefix for Shiratech Solutions

This commit adds devicetree vendor prefix for Shiratech solutions,
a SOM/embedded board manufacturing company.

https://www.shiratech-solutions.com/

Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

Documentation/devicetree/bindings/vendor-prefixes.yaml

@@ -902,6 +902,8 @@ patternProperties:
     description: Sharp Corporation
   "^shimafuji,.*":
     description: Shimafuji Electric, Inc.
+  "^shiratech,.*":
+    description: Shiratech Solutions
   "^si-en,.*":
     description: Si-En Technology Ltd.
   "^si-linux,.*":