IWLAN API review changes

Made several API changes per API council
suggestions.

Test: Manual + unit tests
Bug: 127812471
Bug: 128607082

Merged-In: I0f93c07207b10b566e9f858361e55b18dc0881a0
Change-Id: I0f93c07207b10b566e9f858361e55b18dc0881a0
(cherry picked from commit 806b64228db64e25bd04ab5da607094932561b36)
15 files changed