power_supply: Add new power supply AUTHENTIC property

It is possible that users can use non-standard chargers or use invalid
batteries especially with mobile devices.

This patch adds a new power supply property called 'AUTHENTIC' to
indicate this to the user(user space).

Signed-off-by: Ramakrishna Pallala <ramakrishna.pallala@intel.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
diff --git a/drivers/power/power_supply_sysfs.c b/drivers/power/power_supply_sysfs.c
index 1d96614..be34a6d 100644
--- a/drivers/power/power_supply_sysfs.c
+++ b/drivers/power/power_supply_sysfs.c
@@ -138,6 +138,7 @@
 	POWER_SUPPLY_ATTR(health),
 	POWER_SUPPLY_ATTR(present),
 	POWER_SUPPLY_ATTR(online),
+	POWER_SUPPLY_ATTR(authentic),
 	POWER_SUPPLY_ATTR(technology),
 	POWER_SUPPLY_ATTR(cycle_count),
 	POWER_SUPPLY_ATTR(voltage_max),