porting/examples: fix ble_hci_sock_init assertion

Since HCI socket was initialized by `ble_transport_ll_init` in LL side,
we should remove `ble_hci_sock_init` from example apps.

Signed-off-by: Hang Fan <fanhang8@gmail.com>

porting/examples/linux/main.c

@@ -37,7 +37,6 @@ static struct ble_npl_task s_task_hci;
 
 void nimble_host_task(void *param);
 void ble_hci_sock_ack_handler(void *param);
-void ble_hci_sock_init(void);
 void ble_hci_sock_set_device(int dev);
 void ble_store_ram_init(void);
 
@@ -67,7 +66,6 @@ int main(int argc, char *argv[])
  }
 
  nimble_port_init();
- ble_hci_sock_init();
 
  /* This example provides GATT Alert service */
  ble_svc_gap_init();

porting/examples/linux_blemesh/main.c

@@ -80,7 +80,6 @@ int main(int argc, char *argv[])
  }
 
  nimble_port_init();
- ble_hci_sock_init();
 
  ble_svc_gap_init();
  ble_svc_gatt_init();

porting/examples/nuttx/main.c

@@ -43,7 +43,6 @@ static struct ble_npl_task s_task_hci;
 
 void nimble_host_task(void *param);
 void ble_hci_sock_ack_handler(void *param);
-void ble_hci_sock_init(void);
 void ble_hci_sock_set_device(int dev);
 void ble_store_ram_init(void);
 
@@ -89,9 +88,6 @@ int main(int argc, char *argv[])
  printf("port init\n");
  nimble_port_init();
 
- printf("hci init\n");
- ble_hci_sock_init();
-
  /* This example provides GATT Alert service */
  printf("gap init\n");
  ble_svc_gap_init();