CONFIG_OCTEON_EP_VF is not available for thedefaultarchitecture x86.
Result is shown for architecture 64BIT

Marvell Octeon PCI Endpoint NIC VF Driver

modulename: octeon_ep_vf.ko

configname: CONFIG_OCTEON_EP_VF

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Ethernet driver support
└─>PCI support
└─>Marvell Octeon PCI Endpoint NIC VF Driver
In linux kernel since version 4.19.314 (release Date: 2024-05-17)  
This driver supports the networking functionality of Marvell's
Octeon PCI Endpoint NIC VF.

To know the list of devices supported by this driver, refer to the
documentation in
<file:Documentation/networking/device_drivers/ethernet/marvell/octeon_ep_vf.rst>.

To compile this driver as a module, choose M here.
The name of the module will be octeon_ep_vf.

source code: