dt-bindings: usb: Convert multiple "usb-ohci" bindings to DT schema

"usb-ohci" is another "generic" OHCI controller compatible string used by
several platforms. Add it to the generic-ohci.yaml schema and remove all
the old binding docs.

Marvell pxa-usb.txt has "usb-ohci" in the example, but actual users don't,
so drop it.

Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230110-dt-usb-v3-2-5af0541fcf8c@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

usb: gadget: pxa27x_udc device-tree documentation

Add documentation for device-tree binding of arm PXA 27x udc (usb
device) driver.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Cc: devicetree@vger.kernel.org
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>

USB: ohci-pxa27x: add DT bindings

Add DT bindings to the ohci-pxa27x driver and some documentation.

Successfully tested on a PXA3xx board.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>