zephyr-kernel-test-twister: fix image deployment for zephyr v3.1.0
Twister switched data format from csv to json in v3.1.0.
Signed-off-by: 
Chase Qi <chase.qi@linaro.org>
Twister switched data format from csv to json in v3.1.0.
Signed-off-by: Chase Qi <chase.qi@linaro.org>