usb: gadget: f_serial: Ensure gserial disconnected during unbind

Some UDCs may return an error during pullup disable as part of the
unbind path for a USB configuration.  This will lead to a scenario
where the disable() callback is skipped, whereas the unbind() still
occurs.  If this happens, the u_serial driver will continue to fail
subsequent binds, due to an already existing entry in the ports array.
Ensure that gserial_disconnect() is called during the f_serial unbind,
so the ports entry is properly cleared.

Signed-off-by: Wesley Cheng <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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