template-cts-media2-v7a.yaml: add device type

the device_type line was missed, and cause submission problem.
Fix it here.

Change-Id: I0e99887087299039472389c00ffd7b5020ab4cf3
Signed-off-by: Yongqin Liu <yongqin.liu@linaro.org>
diff --git a/android/hikey-v2/template-cts-media2-v7a.yaml b/android/hikey-v2/template-cts-media2-v7a.yaml
index a34ed90..413e280 100644
--- a/android/hikey-v2/template-cts-media2-v7a.yaml
+++ b/android/hikey-v2/template-cts-media2-v7a.yaml
@@ -1,3 +1,4 @@
+device_type: hi6220-hikey
 job_name: "%%JOB_NAME%%-%%ANDROID_META_BUILD%%-cts-media2-v7a"
 timeouts:
   job: