net: wangxun: add ngbevf build

Add doc build infrastructure for ngbevf driver.
Implement the basic PCI driver loading and unloading interface.
Initialize the id_table which support 1G virtual
functions for Wangxun.

Signed-off-by: Mengyuan Lou <mengyuanlou@net-swift.com>
Link: https://patch.msgid.link/20250704094923.652-10-mengyuanlou@net-swift.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>