Bug fix of bandwidth estimation metric avgBwKbps

Report daily stats instead of the device historical average. That's because avgBwKbps and count are meant to be daily stats which will be aggregated in the pipeline. Reporting the device historical average will result in
over-counting.

Bug: 189953671
Test: manual
Test: atest FrameworksTelephonyTests:com.android.internal.telephony
Change-Id: I07155bdcd75da0eae26d85fe549e0e8c15acddf0