Fix the system_error while calling thread::join() in NativeCallbackThread.

system_server crashed because the system_error "resource_deadlock_would_occur"
occurred while calling thread::join(). It is caused by the value of thread is same
with the calling thread. Correct it using std::this_thread::get_id() to check
whether it is the same thread with the calling thread.

Bug: 70603039
Test step:
     Step 1 : Flash DUT and boot it.
     Step 2 : Connect with PC via USB.
     Step 3 : Run the following adb command and check the DUT: 
              adb shell
              su
              ps -A | grep broadcastradio
              kill xxx(the process id of android.hardware.broadcastradio@intel-service)

Change-Id: Ia21282c4cc631a0788496081b1821be28929fae6
Signed-off-by: Lei,RayX <rayx.lei@intel.com>