usb: common: usb-conn-gpio: use dev_err_probe() to print log

Use dev_err_probe() to print debug or error message depending on
whether the error value is -DPROBE_DEFER or not.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/1621406386-18838-2-git-send-email-chunfeng.yun@mediatek.com


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