Add CellInfo Rate Limiting to DeviceStateMonitor

Add a rate limiting mechanism for fetching CellInfo
when the modem is likely in a low power state. This
is part of the 'last resort' power saving that can
prevent overly chatty traffic to the modem from
causing power regressions.

Bug: 8675309
Test: atest DeviceStateMonitorTest#testWifi
Change-Id: I40e3154047f31663054fbcdd70074762871b5881