HAL_QURT: implement _timer_tick in UARTDriver

libraries/AP_HAL_QURT/Scheduler.cpp

@@ -237,10 +237,11 @@ void *Scheduler::_uart_thread(void *arg)
 
         // process any pending serial bytes
         //((UARTDriver *)hal.uartA)->timer_tick();
-        ((UARTDriver *)hal.uartB)->timer_tick();
-        ((UARTDriver *)hal.uartC)->timer_tick();
-        ((UARTDriver *)hal.uartD)->timer_tick();
-        ((UARTDriver *)hal.uartE)->timer_tick();
+        hal.uartB->timer_tick();
+        hal.uartC->timer_tick();
+        hal.uartD->timer_tick();
+        hal.uartE->timer_tick();
+        hal.uartF->timer_tick();
     }
     return nullptr;
 }

libraries/AP_HAL_QURT/UARTDriver.cpp

@@ -269,7 +269,7 @@ size_t UARTDriver::write(const uint8_t *buffer, size_t size)
   push any pending bytes to/from the serial port. This is called at
   1kHz in the timer thread
  */
-void UARTDriver::timer_tick(void)
+void UARTDriver::_timer_tick(void)
 {
     uint16_t n;
 

libraries/AP_HAL_QURT/UARTDriver.h

@@ -48,7 +48,7 @@ public:
 
     void _read_callback(char *buf, size_t size);
 
-    void timer_tick(void);
+    void _timer_tick(void) override;
     
 private:
     const char *devname;