devlink: Add new "max_mac_per_vf" generic device param

devlink: Add new "max_mac_per_vf" generic device param

Add a new device generic parameter to controls the maximum
number of MAC filters allowed per VF.

For example, to limit a VF to 3 MAC addresses:
 $ devlink dev param set pci/0000:3b:00.0 name max_mac_per_vf \
        value 3 \
        cmode runtime

Signed-off-by: Mohammad Heib <mheib@redhat.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>