qlnxr: remove netdevice.h

Remove unused #includes of a LinuxKPI header noticed while trying to
solve LinuxKPI struct net_device and related functions.
This takes qlnxr out of the picture of D29366.

Sponsored by: The FreeBSD Foundation
(cherry picked from commit 6c8dd7c863f111a22c8548ebf5d7e889117a964d)