feat(demos): add demo for the OSAL (#6182)

Co-authored-by: Gabor Kiss-Vamosi <kisvegabor@gmail.com>

src/lv_init.c

@@ -24,6 +24,8 @@
 #include "draw/lv_draw.h"
 #include "misc/lv_async.h"
 #include "misc/lv_fs.h"
+#include "osal/lv_os_private.h"
+
 #if LV_USE_DRAW_VGLITE
     #include "draw/nxp/vglite/lv_draw_vglite.h"
 #endif
@@ -160,6 +162,8 @@ void lv_init(void)
     lv_profiler_builtin_init(&profiler_config);
 #endif
 
+    lv_os_init();
+
     _lv_timer_core_init();
 
     _lv_fs_init();