extcon: Release locking when sending the notification of connector state

Previously, extcon used the spinlock before calling the notifier_call_chain
to prevent the scheduled out of task and to prevent the notification delay.
When spinlock is locked for sending the notification, deadlock issue
occured on the side of extcon consumer device. To fix this issue,
extcon consumer device should always use the work. it is always not
reasonable to use work.

To fix this issue on extcon consumer device, release locking when sending
the notification of connector state.

Fixes: ab11af04 ("extcon: Add the synchronization extcon APIs to support the notification")
Change-Id: Ifcf301a44ce79e3b76f1044057fa86927b5e425d
Cc: stable@vger.kernel.org
Cc: Roger Quadros <rogerq@ti.com>
Cc: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Git-commit: 8a9dbb779fe882325b9a0238494a7afaff2eb444
Git-Repo: https://android.googlesource.com/kernel/common/


Signed-off-by: Udipto Goswami <ugoswami@codeaurora.org>