spi: dt-bindings: armada-3700: convert to dtschema

Convert txt binding of marvell armada 3700 SoC spi controller to dtschema
to allow for validation.
Signed-off-by: Kousik Sanagavarapu <five231003@gmail.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240417052729.6612-1-five231003@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/spi/marvell,armada-3700-spi.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/marvell,armada-3700-spi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Marvell Armada 3700 SPI Controller
+
+description:
+  The SPI controller on Marvell Armada 3700 SoC.
+
+maintainers:
+  - Kousik Sanagavarapu <five231003@gmail.com>
+
+allOf:
+  - $ref: spi-controller.yaml#
+
+properties:
+  compatible:
+    const: marvell,armada-3700-spi
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  num-cs:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    spi0: spi@10600 {
+        compatible = "marvell,armada-3700-spi";
+        #address-cells = <1>;
+        #size-cells = <0>;
+        reg = <0x10600 0x5d>;
+        clocks = <&nb_perih_clk 7>;
+        interrupts = <GIC_SPI 0 IRQ_TYPE_LEVEL_HIGH>;
+        num-cs = <4>;
+    };
+...

Documentation/devicetree/bindings/spi/spi-armada-3700.txt

-* Marvell Armada 3700 SPI Controller
-
-Required Properties:
-
-- compatible: should be "marvell,armada-3700-spi"
-- reg: physical base address of the controller and length of memory mapped
-       region.
-- interrupts: The interrupt number. The interrupt specifier format depends on
-	      the interrupt controller and of its driver.
-- clocks: Must contain the clock source, usually from the North Bridge clocks.
-- num-cs: The number of chip selects that is supported by this SPI Controller
-- #address-cells: should be 1.
-- #size-cells: should be 0.
-
-Example:
-
-	spi0: spi@10600 {
-		compatible = "marvell,armada-3700-spi";
-		#address-cells = <1>;
-		#size-cells = <0>;
-		reg = <0x10600 0x5d>;
-		clocks = <&nb_perih_clk 7>;
-		interrupts = <GIC_SPI 0 IRQ_TYPE_LEVEL_HIGH>;
-		num-cs = <4>;
-	};