Better biometric subtitle with createConfirmDeviceCredentialIntent() API

Test: Tested manually with repro steps

Fixes: 224967328
Change-Id: I7e83392f5a2df3c258c07e77a9332b2cfde95225

src/com/android/settings/applications/appinfo/AppInfoDashboardFragment.java

@@ -451,6 +451,7 @@ public class AppInfoDashboardFragment extends DashboardFragment
                     };
 
             final BiometricPrompt.Builder builder = new BiometricPrompt.Builder(context)
+                    .setUseDefaultSubtitle() // use default subtitle if subtitle is null/empty
                     .setUseDefaultTitle(); // use default title if title is null/empty
 
             final BiometricManager bm = context.getSystemService(BiometricManager.class);

src/com/android/settings/password/BiometricFragment.java

@@ -129,6 +129,7 @@ public class BiometricFragment extends InstrumentedFragment {
         mBiometricPrompt = new BiometricPrompt.Builder(getContext())
                 .setTitle(promptInfo.getTitle())
                 .setUseDefaultTitle() // use default title if title is null/empty
+                .setUseDefaultSubtitle() // use default subtitle if subtitle is null/empty
                 .setDeviceCredentialAllowed(true)
                 .setSubtitle(promptInfo.getSubtitle())
                 .setDescription(promptInfo.getDescription())

src/com/android/settings/password/ConfirmDeviceCredentialActivity.java

@@ -212,7 +212,7 @@ public class ConfirmDeviceCredentialActivity extends FragmentActivity {
                     getTitleFromCredentialType(credentialType, isEffectiveUserManagedProfile));
         }
         if (mDetails == null) {
-            promptInfo.setSubtitle(
+            promptInfo.setDeviceCredentialSubtitle(
                     getDetailsFromCredentialType(credentialType, isEffectiveUserManagedProfile));
         }