Implement emulator WiFi vendor HAL library

The Android emulator has its own WiFi HAL. When building emulator images
use that implementation.

Bug: 68338427
Test: run cts -m CtsIncidentHostTestCases -t
com.android.server.cts.BatteryStatsValidationTest#testWifiDownload
Exempt-From-Owner-Approval:
Change-Id: I2550addedb14c9c9583dee9f43384bd7d17dde27
(cherry picked from commit 53021da028731bb2ff888dc5915dfddb41fc0e40)
(cherry picked from commit 602e021b5a0c51ecc72d0a646e521446c6f4abf1)
1 file changed