am "bring nan header file, from original KitKat partner version"

merged from goog/mirror-m-wireless-internal-release
4750569 bring nan header file, from original KitKat partner version

diff --cc include/hardware_legacy/wifi_hal.h
index 51bb1a5,be4e985..f4afb99
--- 1/include/hardware_legacy/wifi_hal.h
--- 2/include/hardware_legacy/wifi_hal.h
+++ b/include/hardware_legacy/wifi_hal.h
@@@ -131,8 -129,7 +131,9 @@@ wifi_error wifi_set_nodfs_flag(wifi_int
  #include "tdls.h"
  #include "wifi_logger.h"
  #include "wifi_config.h"
+ #include "wifi_nan.h"
  
 +#ifdef __cplusplus
 +}
  #endif