feat(bluetooth/controller): adjust bt/porting code structure and delete redundant code

components/bt/porting/include/bt_osi_mem.h

@@ -0,0 +1,21 @@
+/*
+ * SPDX-FileCopyrightText: 2015-2021 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#pragma once
+
+#include "sdkconfig.h"
+#include "esp_attr.h"
+#include "esp_heap_caps.h"
+
+void *bt_osi_mem_malloc(size_t size);
+
+void *bt_osi_mem_calloc(size_t n, size_t size);
+
+void *bt_osi_mem_malloc_internal(size_t size);
+
+void *bt_osi_mem_calloc_internal(size_t n, size_t size);
+
+void bt_osi_mem_free(void *ptr);