DataCallSessionStats captures Cross-SIM calling

- DataCallSession has new field 'is_iwlan_cross_sim' to correlate with
  'rat_at_end' field to determine if PDN was over Backup Calling.

AMD:
https://eldar.corp.google.com/assessments/296451350/revisions/12

PDD:
https://eldar.corp.google.com/assessments/649264367/drafts/437679719/sections/55001

Bug: 294240210
Test: New file DataCallSessionStatsTest. Live test.
Change-Id: I52e683df2a5ae7ef00d16d45898ddb449812d3e6
Merged-In: I52e683df2a5ae7ef00d16d45898ddb449812d3e6
1 file changed
tree: d18465de85e32f60d0e98262e8fed9c68d7adb72
  1. stats/
  2. OWNERS