[PATCH v8] ice: Add get/set hw address for VFs using devlink commands

[Karthik Sundaravel]

Dear Maintainers,
    Thanks for the review and suggestions for my patch.

v7 -> v8
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- Added const keyword for the parameter ``mac`` in ice_set_vf_fn_mac()

v6 -> v7
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- Addressed Smatch and checkpatch issues

v5 -> v6
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- Changed data type of vf_id to u16
- Used container_of(port, struct ice_vf, devlink_port) to
  get the vf instead of ice_get_vf_by_id()/ice_put_vf()

v4 -> v5
--------
- Cloned ice_set_vf_mac() to ice_set_vf_fn_mac() so that the
  parameter ice_pf is used instead of net_device of vf
- removed redundant error handling

v3 -> v4
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- Released the vf device by calling ice_put_vf()

v2 -> v3
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- Fill the extack message instead of dev_err()

v1 -> v2
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- called ice_set_vf_mac() directly from the devlink port function
  handlers.

RFC -> v1
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- Add the function handlers to set and get the HW address for the
  VF representor ports.