[nrf fromtree] bluetooth: host: Add missing pending IRK update call for ext adv start

Adds IRK update call to internal bt_le_adv_start_ext. And rename it to
adv_start_ext to prevent confusion with public functions.

There are two paths to start ext advertising:
- bt_le_adv_start can start extended advertising if enabled by calling
internal bt_le_adv_start_ext else it starts legacy advertisements.
- bt_le_ext_adv_start specifically starts extended advertisements.

This commit misses the first path for ext advertisement:
6d137ae

Signed-off-by: Alperen Sener <alperen.sener@nordicsemi.no>
(cherry picked from commit 246050f)

Author: m-alperen-sener

subsys/bluetooth/host/adv.c

@@ -1219,7 +1219,7 @@ static int le_ext_adv_param_set(struct bt_le_ext_adv *adv,
 	return 0;
 }
 
-int bt_le_adv_start_ext(struct bt_le_ext_adv *adv,
+static int adv_start_ext(struct bt_le_ext_adv *adv,
 			const struct bt_le_adv_param *param,
 			const struct bt_data *ad, size_t ad_len,
 			const struct bt_data *sd, size_t sd_len)
@@ -1244,6 +1244,10 @@ int bt_le_adv_start_ext(struct bt_le_ext_adv *adv,
 		return -EALREADY;
 	}
 
+	if (IS_ENABLED(CONFIG_BT_SMP) && atomic_test_bit(bt_dev.flags, BT_DEV_ID_PENDING)) {
+		bt_id_pending_keys_update();
+	}
+
 	adv->id = param->id;
 
 	if (IS_ENABLED(CONFIG_BT_ID_AUTO_SWAP_MATCHING_BONDS)) {
@@ -1327,7 +1331,7 @@ int bt_le_adv_start(const struct bt_le_adv_param *param,
 
 	if (IS_ENABLED(CONFIG_BT_EXT_ADV) &&
 	    BT_DEV_FEAT_LE_EXT_ADV(bt_dev.le.features)) {
-		err = bt_le_adv_start_ext(adv, param, ad, ad_len, sd, sd_len);
+		err = adv_start_ext(adv, param, ad, ad_len, sd, sd_len);
 	} else {
 		err = adv_start_legacy(adv, param, ad, ad_len, sd, sd_len);
 	}