This patch adds new power supply charger driver support
for X-Power AXP288 PMIC integrated charger.

This driver interfaces with the axp20x mfd driver as a cell
and listens to extcon cable events for setting up charging.
Signed-off-by: NRamakrishna Pallala <ramakrishna.pallala@intel.com>
Acked-by: NLee Jones <lee.jones@linaro.org>
Signed-off-by: NSebastian Reichel <sre@kernel.org>