regulator: db8500-prcmu: Use true,false for bool variable

Fix the following coccicheck warning:

drivers/regulator/db8500-prcmu.c:184:1-17: WARNING: Assignment of 0/1 to
bool variable
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Link: https://lore.kernel.org/r/20200506061726.19289-1-yanaijie@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/db8500-prcmu.c

@@ -181,7 +181,7 @@ static int db8500_regulator_switch_disable(struct regulator_dev *rdev)
 		goto out;
 	}
 
-	info->is_enabled = 0;
+	info->is_enabled = false;
 out:
 	return ret;
 }