dt-bindings: power: Convert Actions Owl SPS to DT schema

Convert the Actions S500/S700/S900 Smart Power System binding to DT
schema format. It's a straight-forward conversion.

Reviewed-by: Manivannan Sadhasivam <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Rob Herring (Arm) <[e-mail]>

Documentation/devicetree/bindings/power/actions,owl-sps.txt

···
-Actions Semi Owl Smart Power System (SPS)
-
-Required properties:
-- compatible          :  "actions,s500-sps" for S500
-                         "actions,s700-sps" for S700
-                         "actions,s900-sps" for S900
-- reg                 :  Offset and length of the register set for the device.
-- #power-domain-cells :  Must be 1.
-                         See macros in:
-                          include/dt-bindings/power/owl-s500-powergate.h for S500
-                          include/dt-bindings/power/owl-s700-powergate.h for S700
-                          include/dt-bindings/power/owl-s900-powergate.h for S900
-
-
-Example:
-
-		sps: power-controller@b01b0100 {
-			compatible = "actions,s500-sps";
-			reg = <0xb01b0100 0x100>;
-			#power-domain-cells = <1>;
-		};

Documentation/devicetree/bindings/power/actions,s500-sps.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/power/actions,s500-sps.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Actions Semi Owl Smart Power System (SPS)
+
+maintainers:
+  - Andreas Färber <[e-mail]>
+  - Manivannan Sadhasivam <[e-mail]>
+
+properties:
+  compatible:
+    enum:
+      - actions,s500-sps
+      - actions,s700-sps
+      - actions,s900-sps
+
+  reg:
+    maxItems: 1
+
+  '#power-domain-cells':
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - '#power-domain-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    power-controller@b01b0100 {
+        compatible = "actions,s500-sps";
+        reg = <0xb01b0100 0x100>;
+        #power-domain-cells = <1>;
+    };

MAINTAINERS

···
 F:	Documentation/devicetree/bindings/mmc/owl-mmc.yaml
 F:	Documentation/devicetree/bindings/net/actions,owl-emac.yaml
 F:	Documentation/devicetree/bindings/pinctrl/actions,*
-F:	Documentation/devicetree/bindings/power/actions,owl-sps.txt
+F:	Documentation/devicetree/bindings/power/actions,s500-sps.yaml
 F:	Documentation/devicetree/bindings/timer/actions,owl-timer.yaml
 F:	arch/arm/boot/dts/actions/
 F:	arch/arm/mach-actions/