Add @hide to the biometric interfaces

This change allows the framework to depend on biometric AIDL types, for
example: `android.hardware.biometrics.fingerprint.PointerContext`.

The dependency can be introduced with a `-java-source` target, for
example: `:android.hardware.biometrics.common-V3-java-source`.

The "@hide" annotation informs Metalava that these types are not a
public API (not part of the SDK).

Bug: 218388821
Test: m android.hardware.biometrics.common-update-api
Test: m android.hardware.biometrics.face-update-api
Test: m android.hardware.biometrics.fingerprint-update-api
Change-Id: Ib3327594c64dbb800b9d1744869ceb490d63e553
diff --git a/biometrics/face/aidl/Android.bp b/biometrics/face/aidl/Android.bp
index 0bec0c5..7b11335 100644
--- a/biometrics/face/aidl/Android.bp
+++ b/biometrics/face/aidl/Android.bp
@@ -14,9 +14,9 @@
         "android/hardware/biometrics/face/**/*.aidl",
     ],
     imports: [
-        "android.hardware.biometrics.common",
+        "android.hardware.biometrics.common-V3",
         "android.hardware.common-V2",
-        "android.hardware.keymaster-V3",
+        "android.hardware.keymaster-V4",
     ],
     stability: "vintf",
     backend: {