net/mlx5: refactor bonding representor probing

net/mlx5: refactor bonding representor probing

To probe representor on 2nd PF of kernel bonding device, had to specify
PF1 BDF in devarg:
  <PF1_BDF>,representor=0
When closing bonding device, all representors had to be closed together
and this implies all representors have to use primary PF of bonding
device. So after probing representor port on 2nd PF, when locating new
probed device using device argument, the filter used 2nd PF as PCI
address and failed to locate new device.

Conflict happened by using current representor devargs:
 - Use PCI BDF to specify representor owner PF
 - Use PCI BDF to locate probed representor device.
 - PMD uses primary PCI BDF as PCI device.

To resolve such conflicts, new representor syntax is introduced here:
  <primary BDF>,representor=pfXvfY
All representors must use primary PF as owner PCI device, PMD internally
locate owner PCI address by checking representor "pfX" part. To EAL, all
representors are registered to primary PCI device, the 2nd PF is hidden
to EAL, thus all search should be consistent.

Same to VF representor, HPF (host PF on BlueField) uses same syntax to
probe, example: representor=pf1vf[0-3,-1]

This patch also adds pf index into kernel bonding representor port name:
	<BDF>_<ib_name>_representor_pf<X>vf<Y>

Signed-off-by: Xueming Li <xuemingl@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>