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Add device managed action to sync pending queue work, otherwise
the queued work may run after the work is destroyed.

Fixes: 4ed754de

 ("extcon: Add support for ptn5150 extcon driver")
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Li Jun <jun.li@nxp.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>