i40e: avoid unnecessary register read

We don't need to read the base VF id. It's already stashed in the HW
struct.

Change-Id: Ib81e2f76fc40b12c966e014a856b481912cafefc
Signed-off-by: NMitch Williams <mitch.a.williams@intel.com>
Signed-off-by: NJesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: NSibai Li <sibai.li@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c

@@ -600,8 +600,7 @@ static int i40e_quiesce_vf_pci(struct i40e_vf *vf)
 	int vf_abs_id, i;
 	u32 reg;
 
-	reg = rd32(hw, I40E_PF_VT_PFALLOC);
-	vf_abs_id = vf->vf_id + (reg & I40E_PF_VT_PFALLOC_FIRSTVF_MASK);
+	vf_abs_id = vf->vf_id + hw->func_caps.vf_base_id;
 
 	wr32(hw, I40E_PF_PCI_CIAA,
 	     VF_DEVICE_STATUS | (vf_abs_id << I40E_PF_PCI_CIAA_VF_NUM_SHIFT));