power:bat:trats: Break battery charging with ctrl+C

Add support for disabling battery charging with ctrl+C keyboard
combination pressed.
Moreover the battery update is done more frequently.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Cc: Tom Rini <trini@ti.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>