All machines making use of &usbh_ehci and/or &usbh_ohci use

	phys = <&usbphyc_port0>;

So move this setting into the .dtsi. Also add

	phy-names = "usb";

which isn't used by all machines, but nice for consistency.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>