octeon_ep: Fix host hang issue during device reboot

In the Linux kernel, the following vulnerability has been resolved:

octeon_ep: Fix host hang issue during device reboot

When the host loses heartbeat messages from the device,

the driver calls the device-specific ndo_stop function,

which frees the resources. If the driver is unloaded in

this scenario, it calls ndo_stop again, attempting to free

resources that have already been freed, leading to a host

hang issue. To resolve this, dev_close should be called

instead of the device-specific stop function.dev_close

internally calls ndo_stop to stop the network interface

and performs additional cleanup tasks. During the driver

unload process, if the device is already down, ndo_stop

is not called.