Allow VTS tests to pass on devices without Supplicant AIDL.

Bug: 212653303
Bug: 212652735
Bug: 212652340
Test: Run VTS tests on an AOSP build (since AOSP
       is still using the HIDL interface).
Change-Id: I442efb35c4c68a1337cacc952c3fdb338ef2615d
3 files changed