Add authenticatorId changes to Fingerprint aidl

Also adds a top-level README for the biometric package

Bug: 159667191
Bug: 168541000

Test: make -j56 android.hardware.biometrics.fingerprint-update-api
Test: make -j56 VtsHalBiometricsFingerprintTargetTest

Change-Id: I3dba8e7ee16700865662c1a00b75576d2513f930
diff --git a/biometrics/fingerprint/aidl/default/Fingerprint.cpp b/biometrics/fingerprint/aidl/default/Fingerprint.cpp
index 6eb6237..b5d3949 100644
--- a/biometrics/fingerprint/aidl/default/Fingerprint.cpp
+++ b/biometrics/fingerprint/aidl/default/Fingerprint.cpp
@@ -48,8 +48,8 @@
 }
 
 ndk::ScopedAStatus Fingerprint::generateChallenge(
-        int32_t /*sensorId*/, int32_t /*userId*/, int64_t /*keystoreOperationId*/,
-        int32_t /*timeoutSec*/, const std::shared_ptr<IGenerateChallengeCallback>& /*cb*/) {
+        int32_t /*sensorId*/, int32_t /*userId*/, int32_t /*timeoutSec*/,
+        const std::shared_ptr<IGenerateChallengeCallback>& /*cb*/) {
     return ndk::ScopedAStatus::ok();
 }