Add devlink support to AF driver. Basic devlink support is added.
Currently info_get is the only supported devlink ops.

devlink ouptput looks like this
 # devlink dev
 pci/0002:01:00.0
 # devlink dev info
 pci/0002:01:00.0:
  driver octeontx2-af
 #
Signed-off-by: NSunil Kovvuri Goutham <sgoutham@marvell.com>
Signed-off-by: NJerin Jacob <jerinj@marvell.com>
Signed-off-by: NGeorge Cherian <george.cherian@marvell.com>
Signed-off-by: NJakub Kicinski <kuba@kernel.org>