Merge tag 'extcon-next-for-4.12' of git://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/extcon into char-misc-next

Update extcon for 4.12

Detailed description for this pull request:
1. Add new 'extcon-intel-cht-wc.c' driver
- Intel Cherrytrail Whiskey Cove PMIC extcon driver supports
the detection of the charger connectors and the control.

2. Add new extcon API to monitor the all external connectors.
- The extcon consumer might need to monitor the all supported external
connectors from the extcon device. Before, the extcon consumer
should have each notifier_block structure for each external connector.

In order to support the requirement, the extcon adds new
extcon_register_notifier_all() API. The extcon consumer is able
to monitor the state change of all supported external connectors
from the extcon device by using only one notifier_block.

- extcon_(register|unregister)_notifier_all(struct extcon_dev *edev
				struct notifier_block *nb)
- devm_extcon_(register|unregister)_notifier_all(struct device *dev,
				struct extcon_dev *edev
				struct notifier_block *nb)

3. Remove porting compatibility of old switch class
- The extcon removes the porting compatibility of old switch class
because there are no any use-case and requirement of switch class.

4. Update the extcon drivers and Fix the minor issues
- Revert the ACPI gpio interface on the extcon-usb-gpioc.c.
- Fix the issues related to the suspend-to-ram for both extcon-usb-gpio.c
  and extcon-palmas.c.
- Add warning message for extcon-arizona.c when headphone detection is not
  finished.

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