Add virtual fingerprint HAL APEX

This moves the virtual fingerprint HAL into a vendor apex:
  com.android.hardware.biometrics.fingerprint.virtual.

Bug: 279674662
Test: follow README.md to test the virtual FP HAL
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:7af7ad0c8770e13c3b77abe81c2ba48a2927b531)
Merged-In: I4664a3805b9444c87b0ac31a84ec10fb47d9580e
Change-Id: I4664a3805b9444c87b0ac31a84ec10fb47d9580e
9 files changed