android hikey-v2: add reboot: hard-reset for deployment

add the reboot: hard-reset option for ptable and boot.
according to the comments from bug here:
https://bugs.linaro.org/show_bug.cgi?id=3213#c2

Change-Id: I2ba4366dbe4f5699156cd1bef2f4f98ebef959df
Signed-off-by: Yongqin Liu <yongqin.liu@linaro.org>
diff --git a/android/hikey-v2/template-cts-opengl-v8a.yaml b/android/hikey-v2/template-cts-opengl-v8a.yaml
index e4eeaa1..73598b0 100644
--- a/android/hikey-v2/template-cts-opengl-v8a.yaml
+++ b/android/hikey-v2/template-cts-opengl-v8a.yaml
@@ -51,8 +51,10 @@
     connection: lxc
     images:
       ptable:
+        reboot: hard-reset
         url: https://builds.96boards.org/releases/reference-platform/aosp/hikey/16.03/bootloader/ptable-aosp-8g.img
       boot:
+        reboot: hard-reset
         url: "%%DOWNLOAD_URL%%/boot.img.xz"
         compression: xz
       cache: