DeviceCert: Set device time on test run

To ensure we get consistent timestamp

Test: cert/run_device_cert.sh
Bug: 148147248
Change-Id: I8bdf0cbe1a858d748787f5e19bff9bc523cb5621
diff --git a/system/gd/cert/gd_device_base.py b/system/gd/cert/gd_device_base.py
index 42f7dd7..4ecdb6a 100644
--- a/system/gd/cert/gd_device_base.py
+++ b/system/gd/cert/gd_device_base.py
@@ -79,6 +79,7 @@
         self.serial_number = serial_number
         if self.serial_number:
             self.ad = AdbProxy(serial_number)
+            self.ad.date(time.strftime("%m%d%H%M%Y.%S"))
             self.ad.tcp_forward(int(grpc_port), int(grpc_port))
             self.ad.tcp_forward(
                 int(grpc_root_server_port), int(grpc_root_server_port))