kernel: remove expired i40evf drivers

kernel: remove expired i40evf drivers

In the development history of Intel's drivers, the i40evf driver was later
renamed the iavf driver. For example, some documents mention that
Intel® Network Connections Software Version 24.0 renamed the i40evf
and ixlv drivers to iavf. In subsequent versions, the i40evf driver was
gradually removed, and its functions were taken over by the iavf driver.
In the Linux system, relevant configuration instructions also exist. For
instance, the User Guide for X722 Onboard Network Card states that the
i40evf driver module should be disabled, and the iavf driver should be
installed and used.

blamed commit: https://github.com/openwrt/openwrt/commit/5d81b28a829ac20fb60991e71ee7a7c53d14fd58

Signed-off-by: xiao bo <peterwillcn@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/19197
Signed-off-by: Robert Marko <robimarko@gmail.com>