Integrate fix point parameter test in cmake

Cmake can manage test with ctest. Running them when make test
is run. Unfortunately the only automatic tests the pfw has
(fix point parameter test) are not declared in cmake.

Add a test target and declare the fix point parameter test in cmake.
Thus a simple make test after the make install will run all tests.

Signed-off-by: Kevin Rocard <kevinx.rocard@intel.com>