extcon: gpio: update power management operations

During system resume, other subsystem may need to get the extcon state to
decide if a hotplug device is present. So we need to make sure the extcon
gpio device resumes early and update its state in a sync way.

Change-Id: Id5c4e8c8c7e9196fea8fa8eecb42dfb4914aeb7b
Signed-off-by: Can Guo <cang@codeaurora.org>