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();