Remove HC_BUFFER_HDR_T

#define BT_HC_HDR_SIZE (sizeof(HC_BT_HDR))

typedef struct _hc_buffer_hdr {

  struct _hc_buffer_hdr* p_next; /* next buffer in the queue */

  uint8_t reserved1;

  uint8_t reserved2;

  uint8_t reserved3;

  uint8_t reserved4;

} HC_BUFFER_HDR_T;

#define BT_HC_BUFFER_HDR_SIZE (sizeof(HC_BUFFER_HDR_T))

/******************************************************************************

 *  Extern variables and functions

 *****************************************************************************/