Fix blocking shutdown in doInitialize() when the NFC chip is not responding

[agambier]

While testing the nfcDemo app with a PN7160 on a custom board on which the power supply was defective, I noticed that the function doInitialize()was in a dead lock.

While terminating the reading thread, the function phTmlNfc_CleanUp() is blocked in pthread_join().

This PR :

• Tries to terminate the threads (read & write) with pthread_timedjoin_np()
• Calls pthread_cancel() if the timed join failed.

Beside this PR, another PR in the kernel driver implements optionnal timeout during the read operations.