Re-organize wificond makefile

Re-organize wificond makefile

All tests are now run on the device (unittest and integration).
Stop compiling host side versions of our static libraries.
Move IPC related source into a dedicated static library.
  - integration tests need to be able to speak to wificond
  - integration tests should not be linked against wificond internal
    logic
Move server.cpp into the static library implementing wificond.

Bug: 28867751
Test: Compiles, unittests still pass

Change-Id: Ibe118576dbc09b309d589e5a015941428e3096b7