uhci-platform: Change compatible string from platform-uhci to generic-uhci

This brings the uhci-platform bindings in sync with what we've done for
the ohci- and ehci-platform drivers. As discussed there using platform as a
prefix is a bit weird as the platform bus is a Linux specific thing and
the bindings are supposed to be OS agnostic.

Note that the old platform-uhci compatible string is kept around for, well,
compatibility reasons.

While at it rename the bindings txt file to match the name of all the
other ?hci-platform bindings docs.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/usb/usb-uhci.txt

@@ -2,14 +2,14 @@ Generic Platform UHCI Controller
 -----------------------------------------------------
 
 Required properties:
-- compatible : "platform-uhci"
+- compatible : "generic-uhci" (deprecated: "platform-uhci")
 - reg : Should contain 1 register ranges(address and length)
 - interrupts : UHCI controller interrupt
 
 Example:
 
 	uhci@d8007b00 {
-		compatible = "platform-uhci";
+		compatible = "generic-uhci";
 		reg = <0xd8007b00 0x200>;
 		interrupts = <43>;
 	};

drivers/usb/host/uhci-platform.c

@@ -148,6 +148,7 @@ static void uhci_hcd_platform_shutdown(struct platform_device *op)
 }
 
 static const struct of_device_id platform_uhci_ids[] = {
+	{ .compatible = "generic-uhci", },
 	{ .compatible = "platform-uhci", },
 	{}
 };