WifiServiceImpl: allow for unit tests

Some structural cleanup that allows for WifiServiceImplTest development.

Bug: 33167818
Test: runtests.sh
Change-Id: Ic3ca545f210dfaa3277cc28166b2611b3c818408
7 files changed
tree: 7146fe0793f9f36bc0906c3149f7f8bc62f15a07
  1. libwifi_hal/
  2. libwifi_system/
  3. service/
  4. tests/
  5. PREUPLOAD.cfg