Disable mbed-os-example-atecc608a compilation

The example `mbed-os-example-atecc608a` needs the secure element driver
which is removed from feature branch. The secure element support should
be added to TF-M and when we import TF-M to mbed-os, secure element
will be supported in mbed-os. Because of this compilation of the
example `mbed-os-example-atecc608a` is disabled.

Note: DO NOT merge this to `master` without secure element support in
mbed-os.

Signed-off-by: Devaraj Ranganna <[email protected]>

Author: urutva

tools/test/examples/examples.json

@@ -470,8 +470,8 @@
         "targets" : ["K64F"],
         "toolchains" : ["GCC_ARM"],
         "exporters": [],
-        "compile" : true,
-        "export": true,
+        "compile" : false,
+        "export": false,
         "test" : false,
         "baud_rate": 9600,
         "compare_log": ["mbed-os-example-atecc608a/tests/atecc608a.log"],