Treat car mode as the user interacting with the device.

Car mode may be activated without the user plugging the device into the
car. In this scenario, the user is "interacting" with the device via the
car and so JobScheduler should treat the device as in active use and not
activate JS idle jobs.

Bug: 147846851
Test: atest CtsJobSchedulerTestCases
Change-Id: Ied22ba86b79dac5c5d3db8e646fd5504a9e25645