DeskClock: Use accelerometer instead of orientation sensor

Orientation sensor is deprecated, and usually it requires
devices to have magnetic sensor for orientation sensor
to be available. For flip action, we can just use accelerometer
instead. Solve the problem that flip to action is not available
for device without a magnetic sensor.

FEIJ-539

Change-Id: I716bf5d43a4042bc4da5d8e68126f52974fb1e7d