add LV_CONF_INCLUDE_SIMPLE to choose between relative or simple include of lv_conf.h

lv_misc/lv_task.h

@@ -14,6 +14,12 @@ extern "C" {
 /*********************
  *      INCLUDES
  *********************/
+#if LV_CONF_INCLUDE_SIMPLE
+#include "lv_conf.h"
+#else
+#include "../../lv_conf.h"
+#endif
+
 #include <stdint.h>
 #include <stdbool.h>
 #include "lv_mem.h"