fix(nimble): De-register host cb in stack deinit

porting/nimble/include/hal/hal_uart.h

@@ -50,6 +50,11 @@ typedef int (*hal_uart_rx_char)(void *arg, uint8_t byte);
 int hal_uart_init_cbs(int uart, hal_uart_tx_char tx_func,
   hal_uart_tx_done tx_done, hal_uart_rx_char rx_func, void *arg);
 
+/**
+ * De Initialize already registerd callbacks
+ */
+void hal_uart_deinit_cbs(void);
+
 enum hal_uart_parity {
     /** No Parity */
     HAL_UART_PARITY_NONE = 0,

porting/nimble/src/hal_uart.c

@@ -43,6 +43,14 @@ int hal_uart_init_cbs(int uart_no, hal_uart_tx_char tx_func,
     return 0;
 }
 
+void hal_uart_deinit_cbs(void)
+{
+    hci_uart.tx_char = NULL;
+    hci_uart.rx_char = NULL;
+    hci_uart.tx_done = NULL;
+    hci_uart.u_func_arg = NULL;
+}
+
 static void IRAM_ATTR hci_uart_rx_task(void *pvParameters)
 {
     uart_event_t event;

porting/nimble/src/nimble_port.c

@@ -156,6 +156,8 @@ esp_err_t esp_nimble_deinit(void)
 #if !SOC_ESP_NIMBLE_CONTROLLER || !CONFIG_BT_CONTROLLER_ENABLED
     npl_freertos_funcs_deinit();
 #endif
+
+    ble_transport_ll_deinit();
     return ESP_OK;
 }