dt-bindings: usb: dwc3-imx8mp: dma-range is required only for imx8mp

commit 268eb6fb upstream.

Only i.MX8MP need dma-range property to let USB controller work properly.
Remove dma-range from required list and add limitation for imx8mp.

Fixes: d2a704e2 ("dt-bindings: usb: dwc3-imx8mp: add imx8mp dwc3 glue bindings")
Cc: stable <stable@kernel.org>
Reviewed-by: Jun Li <jun.li@nxp.com>
Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>