Biometrics: Add back import needed by lint.

Test: m out/soong/.intermediates/frameworks/base/doc-comment-check-docs/android_common/doc-comment-check-docs-docs.zip
Bug: 163866361
Bug: 186586694
Change-Id: I1e105ef8bae55c6ad01952739c5b092797217766
diff --git a/core/java/android/hardware/biometrics/BiometricManager.java b/core/java/android/hardware/biometrics/BiometricManager.java
index a778c24..f79c2d3 100644
--- a/core/java/android/hardware/biometrics/BiometricManager.java
+++ b/core/java/android/hardware/biometrics/BiometricManager.java
@@ -27,6 +27,7 @@
 import android.content.Context;
 import android.os.RemoteException;
 import android.os.UserHandle;
+import android.security.keystore.KeyGenParameterSpec;
 import android.security.keystore.KeyProperties;
 import android.util.Slog;