add lv_obj_get_type

lv_objx/lv_kb.c

@@ -346,6 +346,14 @@ static lv_res_t lv_kb_signal(lv_obj_t * kb, lv_signal_t sign, void * param)
     if(sign == LV_SIGNAL_CLEANUP) {
         /*Nothing to cleanup. (No dynamically allocated memory in 'ext')*/
     }
+    else if(sign == LV_SIGNAL_GET_TYPE) {
+        lv_obj_type_t * buf = param;
+        uint8_t i;
+        for(i = 0; i < LV_MAX_ANCESTOR_NUM - 1; i++) {  /*Find the last set data*/
+            if(buf->type[i] == NULL) break;
+        }
+        buf->type[i] = "lv_kb";
+    }
 
     return res;
 }