Wifi-HAL: Add tx time per power level stats in radio_stats

Add support to collect radio transmit per power levels in
msecs accrued over time.

BUG:27227497


Change-Id: Idb00c58540bb8f75040f358072541d2989072162
2 files changed
tree: 27718dfd533940f9d977a51ccdeddd1cd9005f03
  1. qcwcn/
  2. Android.mk