pci: replace devinit/devuninit with probe/remove

Probe and Remove are more appropriate names for PCI init and uninint
operations. This is a cosmetic change.

Only MLX* uses the PCI direct registration, bypassing PMD_* macro.
The callbacks for this too have been updated.

VDEV are left out. For them, init/uninit are more appropriate.

Suggested-by: David Marchand <david.marchand@6wind.com>
Signed-off-by: Shreyansh Jain <shreyansh.jain@nxp.com>
Acked-by: David Marchand <david.marchand@6wind.com>