nimble/phy: Fix wfr time calculations

Rewritten code works with new T_IFS control and fixes few issues:
* delay of RX pipeline is included in calculation (time between access
  address in the air and EVENTS_ADDRESS)
* delay of TX pipeline of preceding packet is also included
* TX->RX transition should be adjusted by only 2 usecs for clock
  accuracy since jitter is intended for wake ups only
* we do not need to adjust for jitter at all since this is covered by
  LL and included in wfr_time
* strange workaround for LE Coded is not needed anymore since this is
  now covered by TX/RX pipelines delays which were missing pieces of
  the puzzle

X-Original-Commit: c4bf3324d65e47aa5cd8510784c825344cdcafc9

nimble/controller/include/controller/ble_phy.h

@@ -134,7 +134,7 @@ void ble_phy_disable(void);
 #define BLE_PHY_WFR_ENABLE_TXRX     (1)
 
 void ble_phy_stop_usec_timer(void);
-void ble_phy_wfr_enable(int txrx, uint32_t wfr_usecs);
+void ble_phy_wfr_enable(int txrx, uint8_t tx_phy_mode, uint32_t wfr_usecs);
 
 /* Starts rf clock */
 void ble_phy_rfclk_enable(void);

nimble/controller/src/ble_ll_conn.c

@@ -1533,7 +1533,7 @@ ble_ll_conn_event_start_cb(struct ble_ll_sched_item *sch)
              */
             usecs = connsm->slave_cur_tx_win_usecs + 61 +
                 (2 * connsm->slave_cur_window_widening);
-            ble_phy_wfr_enable(BLE_PHY_WFR_ENABLE_RX, usecs);
+            ble_phy_wfr_enable(BLE_PHY_WFR_ENABLE_RX, 0, usecs);
             /* Set next wakeup time to connection event end time */
             rc = BLE_LL_SCHED_STATE_RUNNING;
         }

nimble/controller/src/ble_ll_scan.c

@@ -200,7 +200,7 @@ ble_ll_aux_scan_cb(struct ble_ll_sched_item *sch)
     }
 
     STATS_INC(ble_ll_stats, aux_fired_for_read);
-    ble_phy_wfr_enable(BLE_PHY_WFR_ENABLE_RX, BLE_LL_SCHED_ADV_MAX_USECS);
+    ble_phy_wfr_enable(BLE_PHY_WFR_ENABLE_RX, 0, BLE_LL_SCHED_ADV_MAX_USECS);
 
 done: