resource: Add battery resource driver

resource: Add battery resource driver

Add battery resouce driver which read the Linux standard power_supply
interface to get the battery information.

[Detailed description of battery attributes]
- BATTERY_CAPACITY indicates the SoC (State of Charging)and unit is %.
- BATTERY_STATUS indicates the charging status.
- BATTERY_TEMPERATURE indicates the battery temperature.
- BATTERY_VOLTAGE_NOW indicates the voltage value now.
- BATTERY_CURRENT_NOW indicates the current value now.
- BATTERY_PRESENT indicates the connection status of battery.
- BATTERY_ONLINE indicates the connection status of charging cable.

Change-Id: I6011e155d3e401f82538abbccba7ba02e33d796b
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>