eth: fbnic: Add scaffolding for Meta's NIC driver

Create a bare-bones PCI driver for Meta's NIC.
Subsequent changes will flesh it out.

Signed-off-by: Alexander Duyck <alexanderduyck@fb.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/172079935646.1778861.9710282776096050607.stgit@ahduyck-xeon-server.home.arpa


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