regulator: vctrl: Use min() instead of doing it manually

Fix following coccicheck warning:
drivers/regulator/vctrl-regulator.c:188:15-17: WARNING opportunity for max()

Signed-off-by: Haowen Bai <baihaowen@meizu.com>
Link: https://lore.kernel.org/r/1647315190-16139-1-git-send-email-baihaowen@meizu.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: Lotte-Bai

drivers/regulator/vctrl-regulator.c

@@ -185,10 +185,7 @@ static int vctrl_set_voltage_sel(struct regulator_dev *rdev,
 		unsigned int next_sel;
 		int delay;
 
-		if (selector >= vctrl->vtable[vctrl->sel].ovp_min_sel)
-			next_sel = selector;
-		else
-			next_sel = vctrl->vtable[vctrl->sel].ovp_min_sel;
+		next_sel = max_t(unsigned int, selector, vctrl->vtable[vctrl->sel].ovp_min_sel);
 
 		ret = regulator_set_voltage_rdev(rdev->supply->rdev,
 					    vctrl->vtable[next_sel].ctrl,