octeon_ep: Fix memory leak in octep_device_setup()

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

octeon_ep: Fix memory leak in octep_device_setup()

In octep_device_setup(), if octep_ctrl_net_init() fails, the function

returns directly without unmapping the mapped resources and freeing the

allocated configuration memory.

Fix this by jumping to the unsupported_dev label, which performs the

necessary cleanup. This aligns with the error handling logic of other

paths in this function.

Compile tested only. Issue found using a prototype static analysis tool

and code review.