follow #1

seperate files from latest SDK (currently 14.2.0) from good old non-
secure bootloader sdk 11

lib/sdk11/components/libraries/bootloader_dfu/ble_transport/hci_mem_pool_internal.h

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+/* Copyright (c) 2013 Nordic Semiconductor. All Rights Reserved.
+ *
+ * The information contained herein is property of Nordic Semiconductor ASA.
+ * Terms and conditions of usage are described in detail in NORDIC
+ * SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
+ *
+ * Licensees are granted free, non-transferable use of the information. NO
+ * WARRANTY of ANY KIND is provided. This heading must NOT be removed from
+ * the file.
+ *
+ */
+ 
+/** @file
+ *
+ * @defgroup memory_pool_internal Memory Pool Internal
+ * @{
+ * @ingroup memory_pool
+ *
+ * @brief Memory pool internal definitions
+ */
+ 
+#ifndef MEM_POOL_INTERNAL_H__
+#define MEM_POOL_INTERNAL_H__
+
+#define TX_BUF_SIZE       4u    /**< TX buffer size in bytes. */
+#define RX_BUF_SIZE       32u   /**< RX buffer size in bytes. */
+
+#define RX_BUF_QUEUE_SIZE 8u    /**< RX buffer element size. */
+
+#endif // MEM_POOL_INTERNAL_H__
+ 
+/** @} */