Wrap vendor provided HAL in libwifi-hal

While here, fix the include paths so that we explicitly refer to the
headers in hardware_legacy.

Bug: 29396611
Test: Compiles, can associate to an AP on angler/bullhead
Test: runtest frameworks-wifi continues to pass

Change-Id: Ic76ce613b80eb9b3200699c5e1dd083a43e2b1c5
13 files changed
tree: 18c29c91d8bcf2ce53750f02525bfc4c138e1d98
  1. libwifi_hal/
  2. libwifi_system/
  3. service/
  4. tests/