dt-bindings: clock: Convert marvell,armada-370-corediv-clock to DT schema

Convert the Marvell Armada 3xx Core Divider clock binding to DT schema
format.

Add the missing "marvell,armada-390-corediv-clock" compatible and
"clock-output-names" property.

Signed-off-by: Rob Herring (Arm) <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Stephen Boyd <[e-mail]>

Documentation/devicetree/bindings/clock/marvell,armada-370-corediv-clock.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/marvell,armada-370-corediv-clock.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Marvell MVEBU Core Divider Clock
+
+maintainers:
+  - Andrew Lunn <[e-mail]>
+  - Gregory Clement <[e-mail]>
+
+properties:
+  compatible:
+    oneOf:
+      - enum:
+          - marvell,armada-370-corediv-clock
+          - marvell,armada-375-corediv-clock
+          - marvell,armada-380-corediv-clock
+          - marvell,mv98dx3236-corediv-clock
+      - items:
+          - const: marvell,armada-390-corediv-clock
+          - const: marvell,armada-380-corediv-clock
+
+  reg:
+    maxItems: 1
+
+  "#clock-cells":
+    const: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-output-names:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - "#clock-cells"
+  - clocks
+
+additionalProperties: false
+
+examples:
+  - |
+    clock-controller@18740 {
+        compatible = "marvell,armada-370-corediv-clock";
+        reg = <0x18740 0xc>;
+        #clock-cells = <1>;
+        clocks = <&pll>;
+    };

Documentation/devicetree/bindings/clock/mvebu-corediv-clock.txt

···
-* Core Divider Clock bindings for Marvell MVEBU SoCs
-
-The following is a list of provided IDs and clock names on Armada 370/XP:
- 0 = nand (NAND clock)
-
-Required properties:
-- compatible : must be "marvell,armada-370-corediv-clock",
-		       "marvell,armada-375-corediv-clock",
-		       "marvell,armada-380-corediv-clock",
-                       "marvell,mv98dx3236-corediv-clock",
-
-- reg : must be the register address of Core Divider control register
-- #clock-cells : from common clock binding; shall be set to 1
-- clocks : must be set to the parent's phandle
-
-Example:
-
-corediv_clk: corediv-clocks@18740 {
-	compatible = "marvell,armada-370-corediv-clock";
-	reg = <0x18740 0xc>;
-	#clock-cells = <1>;
-	clocks = <&pll>;
-};