dt-bindings: usb: Convert OMAP OHCI/EHCI bindings to schema

The OMAP OHCI and EHCI USB host bindings follow the generic binding, so
add the compatibles and remove the old txt binding docs.

The examples in omap-usb-host.txt don't match actual users, so update
them dropping the fallback compatible.

Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/mfd/omap-usb-host.txt

@@ -64,8 +64,8 @@ Required properties if child node exists:
 Properties for children:
 
 The OMAP HS USB Host subsystem contains EHCI and OHCI controllers.
-See Documentation/devicetree/bindings/usb/ehci-omap.txt and
-Documentation/devicetree/bindings/usb/ohci-omap3.txt.
+See Documentation/devicetree/bindings/usb/ehci-generic.yaml and
+Documentation/devicetree/bindings/usb/ohci-generic.yaml.
 
 Example for OMAP4:
 
@@ -78,14 +78,14 @@ usbhshost: usbhshost@4a064000 {
 	ranges;
 
 	usbhsohci: ohci@4a064800 {
-		compatible = "ti,ohci-omap3", "usb-ohci";
+		compatible = "ti,ohci-omap3";
 		reg = <0x4a064800 0x400>;
 		interrupt-parent = <&gic>;
 		interrupts = <0 76 0x4>;
 	};
 
 	usbhsehci: ehci@4a064c00 {
-		compatible = "ti,ehci-omap", "usb-ehci";
+		compatible = "ti,ehci-omap";
 		reg = <0x4a064c00 0x400>;
 		interrupt-parent = <&gic>;
 		interrupts = <0 77 0x4>;

Documentation/devicetree/bindings/usb/generic-ehci.yaml

@@ -74,6 +74,7 @@ properties:
           - const: usb-ehci
       - enum:
           - generic-ehci
+          - ti,ehci-omap
           - usb-ehci
 
   reg:

Documentation/devicetree/bindings/usb/generic-ohci.yaml

@@ -46,7 +46,9 @@ properties:
               - ingenic,jz4740-ohci
               - snps,hsdk-v1.0-ohci
           - const: generic-ohci
-      - const: generic-ohci
+      - enum:
+          - generic-ohci
+          - ti,ohci-omap3
       - items:
           - enum:
               - cavium,octeon-6335-ohci