Added more testcases

- added testcases to test session, logical channel and transmit on a
  channel
- added some function stubs to be implemented latter
- implemented open basic channel function
Implemented channel transmit function

- Implemented channel trasmit
- Implemented select next
- Added reference counter to AID
- Integration-test passed
Implemented get select response function

- implemented get select response in channel
- added testcase for select response
- added reference counter to maintain apdu (It might be passed through
  different modules)
Minor architecture refactory

- Make each module more modular.
- Seperate some staff in tee_se_protocol.h to tee_se_aid.h and tee_se_apdu.h
- Move session related operations from tee_se_manager.c to
  tee_se_session.c
- Added testcase for aid.