dt-bindings: mmc: brcm,kona-sdhci: convert to YAML

Convert Broadcom Kona family SDHCI controller bindings to DT schema.

Changes during conversion:
  - also mark reg and interrupts as required
  - drop deprecated compatible (it's been deprecated for ~10 years)
Signed-off-by: Stanislav Jakubek <stano.jakubek@gmail.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/a1fd4092b8a31c2ee58a3cd4cca062db13197b45.1683548624.git.stano.jakubek@gmail.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Documentation/devicetree/bindings/mmc/brcm,kona-sdhci.txt

-Broadcom BCM281xx SDHCI
-
-This file documents differences between the core properties in mmc.txt
-and the properties present in the bcm281xx SDHCI
-
-Required properties:
-- compatible : Should be "brcm,kona-sdhci"
-- DEPRECATED: compatible : Should be "bcm,kona-sdhci"
-- clocks: phandle + clock specifier pair of the external clock
-
-Refer to clocks/clock-bindings.txt for generic clock consumer properties.
-
-Example:
-
-sdio2: sdio@3f1a0000 {
-	compatible = "brcm,kona-sdhci";
-	reg = <0x3f1a0000 0x10000>;
-	clocks = <&sdio3_clk>;
-	interrupts = <0x0 74 0x4>;
-};
-

Documentation/devicetree/bindings/mmc/brcm,kona-sdhci.yaml

+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mmc/brcm,kona-sdhci.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Broadcom Kona family SDHCI controller
+
+maintainers:
+  - Florian Fainelli <f.fainelli@gmail.com>
+
+allOf:
+  - $ref: sdhci-common.yaml#
+
+properties:
+  compatible:
+    const: brcm,kona-sdhci
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - interrupts
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/clock/bcm281xx.h>
+
+    mmc@3f1a0000 {
+        compatible = "brcm,kona-sdhci";
+        reg = <0x3f1a0000 0x10000>;
+        clocks = <&master_ccu BCM281XX_MASTER_CCU_SDIO3>;
+        interrupts = <GIC_SPI 74 IRQ_TYPE_LEVEL_HIGH>;
+    };
+...