Removes freePort from the HAL (#116)

It was a no-op, and most likely in the future it will be that way too.
Removing to clean up the API.

wpilibc/athena/src/SolenoidBase.cpp

@@ -25,7 +25,6 @@ SolenoidBase::SolenoidBase(uint8_t moduleNumber)
     SolenoidBase::m_ports[moduleNumber][i] =
         initializeSolenoidPort(port, &status);
     wpi_setErrorWithContext(status, getHALErrorMessage(status));
-    freePort(port);
   }
 }