Smear ModemActivityInfo across multiple stats

If ModemActivityInfo is available on a device, smear the provided
transmit and received times across RadioAccessTechnology and frequency
(for NR RAT).

Bug: 207697945
Test: atest BatteryStatsNoteTest
Change-Id: Ifb4e30dc3fa5ac5dd4824a87a7a86c4a0d14d019
(cherry picked from commit e85ac323)