2/n: Add default implementation for multi-biometric enroll

1) Adds a layout for multi-biometric selection in BiometricEnrollActivity
2) Adds widgets for checkboxes
3) Shows ConfirmLock*/ChooseLock* for multi-biometric devices in
   BiometricEnrollActivity
4) finish()'s when loses foreground
5) Adds default string for ChooseLock* and multi-biometrics, e.g.
   "Set up Password + Biometrics", as well as associated plumbing
   to bring the user back to BiometricEnrollActivity once the
   credential is enrolled
6) When max templates enrolled, checkbox becomes disabled and
   description string is updated

Bug: 162341940
Bug: 152242790
Fixes: 161742393

No effect on existing devices with the following:
Test: adb shell am start -a android.settings.BIOMETRIC_ENROLL
Test: SUW
Test: make -j RunSettingsRoboTests

Exempt-From-Owner-Approval: Biometric-related change
to EncryptionInterstitial

Change-Id: I855460d50228ace24d4ec5fbe330f02ab406cc02

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

@@ -200,8 +200,9 @@ public class SetupChooseLockGeneric extends ChooseLockGeneric {
                                 .getBooleanExtra(SetupSkipDialog.EXTRA_FRP_SUPPORTED, false),
                         /* isPatternMode= */ false,
                         /* isAlphaMode= */ false,
-                        /* isFingerprintSupported= */ false,
-                        /* isFaceSupported= */ false
+                        /* forFingerprint= */ false,
+                        /* forFace= */ false,
+                        /* forBiometrics= */ false
                 );
                 dialog.show(getFragmentManager());
                 return true;
@@ -242,7 +243,7 @@ public class SetupChooseLockGeneric extends ChooseLockGeneric {
         }
 
         private boolean isForBiometric() {
-            return mForFingerprint || mForFace;
+            return mForFingerprint || mForFace || mForBiometrics;
         }
     }