HardwareTimer: pause() need to call HAL API to restore HAL state

Due to HAL Cube update it is now required to stop timer with HAL API
otherwise HAL state is not restored to HAL_TIM_STATE_READY.
Nevertheless it is not sufficient to guarantee that timer is stopped.
specially if some channels are still running.
So it is also necessary to call LL_TIM_DisableCounter()

Signed-off-by: Alexandre Bourdiol <alexandre.bourdiol@st.com>

Author: ABOSTM

cores/arduino/HardwareTimer.cpp

@@ -108,7 +108,11 @@ void HardwareTimer::pause()
   __HAL_TIM_DISABLE_IT(&(_timerObj.handle), TIM_IT_CC3);
   __HAL_TIM_DISABLE_IT(&(_timerObj.handle), TIM_IT_CC4);
 
-  // Disable timer unconditionally
+  // Stop timer. Required to restore HAL State: HAL_TIM_STATE_READY
+  HAL_TIM_Base_Stop(&(_timerObj.handle));
+
+  /* Disable timer unconditionally. Required to quarantee timer is stopped,
+   * even if some channels are still running */
   LL_TIM_DisableCounter(_timerObj.handle.Instance);
 
 #if defined(TIM_CHANNEL_STATE_SET_ALL)