pinctrl: stm32: Switch to use dev_err_probe() helper

In the probe path, dev_err() can be replace with dev_err_probe()
which will check if error code is -EPROBE_DEFER and prints the
error name.

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20220917122015.1893880-1-yangyingliang@huawei.com


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>