spi: dt-bindings: snps,dw-apb-ssi: Add compatible for Intel Mount Evans SoC

Document the DesignWare SSI controller compatible for Intel Mount Evans
Integrated Management Complex SoC.

Signed-off-by: Abe Kohandel <abe.kohandel@intel.com>
Link: https://lore.kernel.org/r/20230606145402.474866-3-abe.kohandel@intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: Abe Kohandel

Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml

@@ -74,6 +74,8 @@ properties:
         const: intel,keembay-ssi
       - description: Intel Thunder Bay SPI Controller
         const: intel,thunderbay-ssi
+      - description: Intel Mount Evans Integrated Management Complex SPI Controller
+        const: intel,mountevans-imc-ssi
       - description: AMD Pensando Elba SoC SPI Controller
         const: amd,pensando-elba-spi
       - description: Baikal-T1 SPI Controller