nimble/ll: Split LL initialization

This splits LL intiialization into two phases, one that initialize all
LL internals and second that is called when LL side of transport is
initialized. This makes sure that all internals are fully initialized
before host sends any commands or LL sends any events (since HS side of
transport is initialized before LL side) regardless of how much time
pass between those HS and LL transport initialization.

nimble/controller/pkg.yml

@@ -41,3 +41,8 @@ pkg.deps:
     - "@apache-mynewt-core/crypto/tinycrypt"
     - nimble
     - nimble/transport
+
+pkg.init:
+    ble_ll_init:
+        - $before:ble_transport_hs_init
+        - $before:ble_transport_ll_init

nimble/controller/src/ble_ll.c

@@ -1371,9 +1371,6 @@ ble_ll_task(void *arg)
                                                   MYNEWT_VAL(BLE_LL_TX_PWR_MAX_DBM)));
     g_ble_ll_tx_power_phy_current = INT8_MAX;
 
-    /* Tell the host that we are ready to receive packets */
-    ble_ll_hci_send_noop();
-
     while (1) {
         ev = ble_npl_eventq_get(&g_ble_ll_data.ll_evq, BLE_NPL_TIME_FOREVER);
         BLE_LL_ASSERT(ev);
@@ -1767,7 +1764,7 @@ ble_ll_assert(const char *file, unsigned line)
  *
  * @return int
  */
-static void
+void
 ble_ll_init(void)
 {
     int rc;
@@ -2003,7 +2000,8 @@ ble_transport_to_ll_iso_impl(struct os_mbuf *om)
 void
 ble_transport_ll_init(void)
 {
-    ble_ll_init();
+    /* Tell the host that we are ready to receive packets */
+    ble_ll_hci_send_noop();
 }
 
 int