i40e: Fix NPAR Tx Scheduler init

Recent changes to the driver initialization have caused the BW
configurations to not take effect.  We use a BW configuration read and
write back to "kick" the Tx scheduler into action.

Change-ID: I94ab377c58d3a3986e3de62b6c199be3fd2ee5e6
Signed-off-by: Greg Rose <gregory.v.rose@intel.com>
Tested-by: Jim Young <james.m.young@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/i40e/i40e_main.c

@@ -7576,6 +7576,10 @@ static int i40e_sw_init(struct i40e_pf *pf)
 
 	mutex_init(&pf->switch_mutex);
 
+	/* If NPAR is enabled nudge the Tx scheduler */
+	if (pf->hw.func_caps.npar_enable && (!i40e_get_npar_bw_setting(pf)))
+		i40e_set_npar_bw_setting(pf);
+
 sw_init_done:
 	return err;
 }