iorap: Stop compilation when the device is not idle.

System service sends each package name to iorap during idle time
for compilation and only sends the next one after the current one is done.
When the device is not idle, stop sending the following packages.

Bug: 171438036
Test: Run 'adb shell cmd jobscheduler run -f android 283673059'
and 'adb shell cmd jobscheduler timeout android 283673059' and check the
log.

Change-Id: I39e6cf83a55ce8b4e8c3c7984391fad6dd86a4e7