pwm: stm32-lp: Use regmap_clear_bits and regmap_set_bits where applicable

Found using coccinelle and the following semantic patch:

@@
expression map, reg, bits;
@@

- regmap_update_bits(map, reg, bits, bits)
+ regmap_set_bits(map, reg, bits)

@@
expression map, reg, bits;
@@

- regmap_update_bits(map, reg, bits, 0)
+ regmap_clear_bits(map, reg, bits)

Tested-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Link: https://lore.kernel.org/r/20221115111347.3705732-5-u.kleine-koenig@pengutronix.de
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

drivers/pwm/pwm-stm32-lp.c

@@ -140,8 +140,7 @@ static int stm32_pwm_lp_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 
 	if (reenable) {
 		/* Start LP timer in continuous mode */
-		ret = regmap_update_bits(priv->regmap, STM32_LPTIM_CR,
-					 STM32_LPTIM_CNTSTRT,
+		ret = regmap_set_bits(priv->regmap, STM32_LPTIM_CR,
 				      STM32_LPTIM_CNTSTRT);
 		if (ret) {
 			regmap_write(priv->regmap, STM32_LPTIM_CR, 0);