regulator: rtmv20: Add missing regcache cache only before marked as dirty

Add missing regcache cache only before masked as dirty.
Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
Link: https://lore.kernel.org/r/1601461132-15251-1-git-send-email-u0084500@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/rtmv20-regulator.c

@@ -325,6 +325,7 @@ static int rtmv20_probe(struct i2c_client *i2c)
 	 * keep in shutdown mode to minimize the current consumption
 	 * and also mark regcache as dirty
 	 */
+	regcache_cache_only(priv->regmap, true);
 	regcache_mark_dirty(priv->regmap);
 	gpiod_set_value(priv->enable_gpio, 0);