extcon-usb-gpio: Schedule delayed work in probe for ethernet connection

Schedule work with delay in probe() so that GPIO can toggled to reset
ethernet bridge after host mode start. Or else ethernet network device
is not detected on some platforms having onboard ethernet bridge.

Change-Id: Ia8369133206c69320ed95c3a7523dcc6e2667894
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>