ARM: dts: imx25: describe maximum speed of internal usbhost port1 phy

The internal usbphy of usbhost port1 is only full-speed capable.
We set this limitation in the dtsi.

Signed-off-by: Michael Grzeschik <[e-mail]>
Reviewed-by: Fabio Estevam <[e-mail]>
Signed-off-by: Shawn Guo <[e-mail]>

arch/arm/boot/dts/imx25.dtsi

···
 				clock-names = "ipg", "ahb", "per";
 				fsl,usbmisc = <&usbmisc 1>;
 				fsl,usbphy = <&usbphy1>;
+				maximum-speed = "full-speed";
 				phy_type = "serial";
 				dr_mode = "host";
 				status = "disabled";