AP_OpticalFlow: fix for HAL_SITL rename

libraries/AP_OpticalFlow/OpticalFlow.cpp

@@ -44,7 +44,7 @@ const AP_Param::GroupInfo OpticalFlow::var_info[] PROGMEM = {
 OpticalFlow::OpticalFlow(void) :
 #if CONFIG_HAL_BOARD == HAL_BOARD_PX4
     backend(new AP_OpticalFlow_PX4(*this))
-#elif CONFIG_HAL_BOARD == HAL_BOARD_AVR_SITL
+#elif CONFIG_HAL_BOARD == HAL_BOARD_SITL
     backend(new AP_OpticalFlow_HIL(*this))
 #else
     backend(NULL)

libraries/AP_OpticalFlow/examples/AP_OpticalFlow_test/AP_OpticalFlow_test.pde

@@ -10,7 +10,7 @@
 #include <AP_Math.h>
 #include <AP_HAL.h>
 #include <AP_HAL_AVR.h>
-#include <AP_HAL_AVR_SITL.h>
+#include <AP_HAL_SITL.h>
 #include <AP_AHRS.h>
 #include <AP_Compass.h>
 #include <AP_Declination.h>