spi: dt-binding: document microchip coreQSPI

Add microchip coreQSPI compatible string and update the title/description
to reflect this addition.
Signed-off-by: NNaga Sureshkumar Relli <nagasuresh.relli@microchip.com>
Reviewed-by: NConor Dooley <conor.dooley@microchip.com>
Acked-by: NKrzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220808064603.1174906-2-nagasuresh.relli@microchip.comSigned-off-by: NMark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/spi/microchip,mpfs-spi.yaml

@@ -4,7 +4,11 @@
 $id: http://devicetree.org/schemas/spi/microchip,mpfs-spi.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
-title: Microchip MPFS {Q,}SPI Controller Device Tree Bindings
+title: Microchip FPGA {Q,}SPI Controllers
+
+description:
+  SPI and QSPI controllers on Microchip PolarFire SoC and the "soft"/
+  fabric IP cores they are based on
 
 maintainers:
   - Conor Dooley <conor.dooley@microchip.com>
@@ -17,6 +21,7 @@ properties:
     enum:
       - microchip,mpfs-spi
       - microchip,mpfs-qspi
+      - microchip,coreqspi-rtl-v2 # FPGA QSPI
 
   reg:
     maxItems: 1