Conservatively trim data usage stats.

Instead of trusting NTP time alone, use the most-conservative of
system clock and NTP.

Bug: 5584564
Change-Id: I5dd87fc009959b1cf0a7d660e385a0b1a8be238b
1 file changed
tree: 0e1014c58f315fb14ea259453b33b0e2dbfd7bee
  1. core/
  2. services/
  3. wifi/