Require internal permission for BIOMETRIC_CONVENIENCE

At the request of Android API council, this commit adds the
@RequirePermission annotation to the @SystemApi constant
BiometricManager.Authenticators#BIOMETRIC_CONVENIENCE.

Test: atest com.android.server.biometrics
Fixes: 148596159
Change-Id: I9ec3fdf70b0abde601301012c8940116462fcc38
2 files changed