usb: phy: never defer probe in non-OF case

In practice failure to find phy when requested in non-OF
case means it will never become available, so
__usb_find_phy() must return -ENODEV and not -EPROBE_DEFER.

This fixes a regression caused by commit 9c9d8249
(usb: phy: Fix deferred probing), where the USB
controller driver is left infinitely into deferred probe
when there are no phys.

Fixes: 9c9d8249 (usb: phy: Fix deferred probing)
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>