power_supply: Update power_supply_is_watt_property

Update the power_supply_is_watt_property function to include POWER_NOW.

Signed-off-by: Rhyland Klein <rklein@nvidia.com>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index 20f23fe..204c18d 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -251,6 +251,7 @@
 	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
+	case POWER_SUPPLY_PROP_POWER_NOW:
 		return 1;
 	default:
 		break;