BACKPORT: usb: xhci: plat: remove error log for failure to get usb-phy

Remove this log to avoid non-error conditions.
If CONFIG_USB_PHY is disabled, the following error message appears:
[    0.231609] xhci-hcd f10f0000.usb3: xhci_plat_probe get usb3phy fail (ret=-6)
[    0.239716] xhci-hcd f10f8000.usb3: xhci_plat_probe get usb3phy fail (ret=-6)
In this case, devm_usb_get_phy_by_phandle is declared static inline
and returns -ENXIO.

It is easy to pinpoint the failure to get the usb-phy using the debug
log in drivers/usb/phy/phy.c. Therefore, it can be removed.

Signed-off-by: Stanley Chang <stanley_chang@realtek.com>
Tested-by: Klaus Kudielka <klaus.kudielka@gmail.com>
Link: https://lore.kernel.org/r/20230510075129.28047-1-stanley_chang@realtek.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Bug: 286930662
(cherry picked from commit 424e0293
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git

 usb-next)
Signed-off-by: Stanley Chang <stanley_chang@realtek.com>
Change-Id: I872ceb810cd0389700342911cc601f1703d557cd