samsung: misc: new feature: common interactive charger

samsung: misc: new feature: common interactive charger

This change adds common interactive charger feature with
display support.

New config: CONFIG_INTERACTIVE_CHARGER

New functions:
- battery() - which takes one of commands parameter:
    BOOT_CHECK: check battery present, low power mode;
		check battery charge level, draw battery screen
    STATE:      display battery screen with current state of charge
		this is for command line use
    CHARGE:     start interactive charger for every battery charge level
		this is also for command line use

- interactive_charger() - loop function for charge the battery and do:
			  - update of battery screen,
			  - update charge animation,
			  - check for exit condition (if charge level >= 20%)
			  - clear screen after 10 seconds animation
			  - draw battery on clean screen if any key pressed

There are few constants defined for this feature:
- CHARGE_TRESHOLD_BOOT:         20 (20 percent of charge)
- CHARGE_DISPLAY_TIMEOUT_SEC:   10 (time for animation display)
- CONNECT_CHARGER_TIMEOUT_SEC:  5 (time for connect charger animation)
- CHARGE_PWR_KEY_RESET_TIMEOUT: 3 (time for PWR key press to reset device)

Battery charge level cases:
 - 0-20 % - don't allow to boot and then:
	    - enable charger if connected and start charge animation
	      or if no charger:
	    - display 5 sec charger animation and turn off the device

- > 20 %  - don't display battery screen and boot device

Charge mode can be break by keys VOLUP + VOLDOWN. If charge level > 20%
then device can be enabled by pressing PWR key for a time defined in
CHARGE_PWR_KEY_RESET_TIMEOUT.

Change-Id: I15066a4b86c89f1f0124b072a0aeb7246b29b279
Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>