TEST: update example.json file

Author: Qinghao Shi

tools/test/examples/examples.json

@@ -469,9 +469,9 @@
         "github": "https://github.com/ARMmbed/mbed-os-example-atecc608a",
         "mbed": [],
         "test-repo-source": "github",
-        "features" : [],
+        "features" : ["HAS_CRYPTOKIT"],
         "targets" : ["K64F"],
-        "toolchains" : [],
+        "toolchains" : ["GCC_ARM"],
         "exporters": [],
         "compile" : true,
         "export": true,