Fix zephyr samples build issue caused by zephyr kernel API update (#232)

* Clean compiling warnings of zephyr samples

* Support xtensa AOT and fix build issue of alios

* Refine wgl native functions call

* Fix zephyr samples build issue caused by zephyr kernel API update

samples/gui/wasm-runtime-wgl/src/platform/zephyr/main.c

@@ -16,7 +16,7 @@ void main(void)
 {
     iwasm_main();
     for(;;){
-        k_sleep(1000);
+        k_sleep(Z_TIMEOUT_MS(1000));
     }
 }