Don't compile the HIDL interface for the emulator

Similar to GCE the public emulator uses hostapd to simulate a virtual
access point. This means that there is no need for HIDL support in
hostapd for these target devices.

BUG: 74514143
Test: Emulator images compile and run with WiFi
Change-Id: Id74388e90639300c2eab2d465c8b6591d598043c
1 file changed