mfd: max77705: max77705_charger: move active discharge setting to mfd parent

mfd: max77705: max77705_charger: move active discharge setting to mfd parent

Active discharge setting is a part of MFD top level i2c device, hence
cannot be controlled by charger. Writing to MAX77705_PMIC_REG_MAINCTRL1
register from charger driver is a mistake.

Move active discharge setting to MFD parent driver.

Fixes: a6a494c8e3ce ("power: supply: max77705: Add charger driver for Maxim 77705")
Signed-off-by: Dzmitry Sankouski <dsankouski@gmail.com>
Acked-by: Lee Jones <lee@kernel.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>