pinctrl: rockchip: remove redundant check

The check limiting bias options to supported ones is already
done thru rockchip_pinconf_pull_valid. Therefore this check is
redundant and can be removed.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-rockchip.c

@@ -424,12 +424,6 @@ static int rockchip_set_pull(struct rockchip_pin_bank *bank,
 
 	switch (ctrl->type) {
 	case RK2928:
-		if (pull != PIN_CONFIG_BIAS_PULL_PIN_DEFAULT &&
-					pull != PIN_CONFIG_BIAS_DISABLE) {
-			dev_err(info->dev, "only PIN_DEFAULT and DISABLE allowed\n");
-			return -EINVAL;
-		}
-
 		ctrl->pull_calc_reg(bank, pin_num, &reg, &bit);
 
 		spin_lock_irqsave(&bank->slock, flags);