iio: dac: ltc2688: make use of regmap_set_bits()

Instead of using regmap_update_bits() and passing the mask twice, use
regmap_set_bits().
Suggested-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Signed-off-by: Trevor Gamblin <tgamblin@baylibre.com>
Acked-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Link: https://patch.msgid.link/20240617-review-v3-19-88d1338c4cca@baylibre.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/dac/ltc2688.c

@@ -860,8 +860,7 @@ static int ltc2688_setup(struct ltc2688_state *st, struct regulator *vref)
 		/* bring device out of reset */
 		gpiod_set_value_cansleep(gpio, 0);
 	} else {
-		ret = regmap_update_bits(st->regmap, LTC2688_CMD_CONFIG,
-					 LTC2688_CONFIG_RST,
+		ret = regmap_set_bits(st->regmap, LTC2688_CMD_CONFIG,
 				      LTC2688_CONFIG_RST);
 		if (ret)
 			return ret;