[hal, wpilib] Remove analog accumulator and analog gyro (#7697)

The 2 high level classes were temporarily kept to keep the examples compiling. We will remove those when we have the interface into the built in IMU.

hal/src/main/native/systemcore/HAL.cpp

@@ -50,8 +50,6 @@ void InitializeHAL() {
   InitializeREVPH();
   InitializeAddressableLED();
   InitializeAccelerometer();
-  InitializeAnalogAccumulator();
-  InitializeAnalogGyro();
   InitializeAnalogInput();
   InitializeAnalogTrigger();
   InitializeCAN();