Bug fix of isModemActivityInfoValid

- In ENDC/NRDC cases, it will have both RATs concurrently, so cannot use
the duration time to check the total Rx time and Tx time if valid or not.
- The activity duration time will be different between modem and
framework, so add some extra time difference to make up for this
unavoidable delay.

Bug: 260655203
Bug: 261680635
Bug: 263458527
Test: manual
Change-Id: I4589d24ebb90aa04cfdd5d492fef69f270435dfd
1 file changed