power: supply: rt9471: fix using wrong ce_gpio in rt9471_probe()

Pass the correct 'ce_gpio' to IS_ERR(), and remove the ce_gpio in
chip data, make it all by SW control only, not to control by HW pin.

Fixes: 4a1a5f67 ("power: supply: rt9471: Add Richtek RT9471 charger driver")
Reviewed-by: ChiYuan Huang <cy_huang@richtek.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>