samsung: misc: new command: battery and config CONFIG_CMD_BATTERY

samsung: misc: new command: battery and config CONFIG_CMD_BATTERY

This feature allows to enable interactive charger by command line
or use interactive charger for display battery charge level.

Usage:
- battery [<state>] [<charge>]

Option "state" will display battery screen for 2 seconds.
Option "charge" will start interactive charger mode.

Interactive charger mode can be stopped by:
- pressing CTRL+C keys combination,
or device reset by:
- pressing PWR key for 5 seconds (only if SOC > 20% - one grey bar),
- pressing PWR key for 10 seconds, which is PMIC reset.

Change-Id: I622830198f6cba4f0fa30798b02aa003c55332bb
Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>