ice: minor: rename goto labels from err to unroll

Clean up goto labels after previous commit, to conform to single naming
scheme in ice_probe() and ice_init_dev().

Reviewed-by: Marcin Szycik <marcin.szycik@linux.intel.com>
Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>