WifiStateMachine: clean up dead code

Cleaned up the dead code from the original exponential back off
scan implementation.

Bug: 28750989
Bug: 28070598

Change-Id: I8abf82cdaa3530fb514794b4004c5d3f15950672
Tests: Wifi Unit Tests, manual test
3 files changed
tree: 210e49fe6034efe73081f7076594ffa9e217c3d5
  1. service/
  2. tests/