ice: Remove unnecessary variable

In ice_init_phy_user_cfg, vsi is used only to get to hw. Remove this
and just use pi->hw

Signed-off-by: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>
Tested-by: Tony Brelinski <tonyx.brelinski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>