[Biometric Onboarding & Edu] Update fingerprint settings page

- Added a feature provider for fingerprint settings page in
  FingerprintFeatureProvider for customization
- When no fingerprint enrolled, disabled the settings buttons instead of
  hiding them.
- Update new UX style for add fingerprint button

Bug: 370940762
Test: manual - 1. Enroll a fingerprint
               2. Go Fingerprint Settings page and remove fingerprint
	       3. Enroll fingerprint again
Test: atest FingerprintSettingsFragmentTest
Flag: com.android.settings.flags.biometrics_onboarding_education

Change-Id: Ibe47bb241c4b20e8e0c5b4a9172aef90bf3727ea

src/com/android/settings/biometrics/fingerprint/FingerprintSettingsAppsPreferenceController.java

@@ -23,6 +23,7 @@ import android.hardware.fingerprint.FingerprintManager;
 import android.provider.Settings;
 
 import androidx.annotation.NonNull;
+import androidx.preference.Preference;
 
 import com.android.settings.Utils;
 import com.android.settings.biometrics.activeunlock.ActiveUnlockStatusUtils;
@@ -53,6 +54,20 @@ public class FingerprintSettingsAppsPreferenceController
                 isChecked ? ON : OFF, getUserId());
     }
 
+    @Override
+    public void updateState(Preference preference) {
+        super.updateState(preference);
+        if (!FingerprintSettings.isFingerprintHardwareDetected(mContext)) {
+            preference.setEnabled(false);
+        } else if (!mFingerprintManager.hasEnrolledTemplates(getUserId())) {
+            preference.setEnabled(false);
+        } else if (getRestrictingAdmin() != null) {
+            preference.setEnabled(false);
+        } else {
+            preference.setEnabled(true);
+        }
+    }
+
     @Override
     public int getAvailabilityStatus() {
         final ActiveUnlockStatusUtils activeUnlockStatusUtils =