Establish permanently unavailable settings

Distinguish between settings which are permanently unavailable on
the device, and temporarily unavailable. This enables us to restrict
which setting slices are exposed in onSliceGetDescendants.

The primary changes in this CL are renaming:
"DISABLED_UNSUPPORTED" -> "UNSUPPORTED_ON_DEVICE"
to be more clear the the setting will cannot be accessed on the device, and,
adding a new enum to encapsulate settings which are currently unavailable, but
could be enabled in the future.

Also remove UNAVAILABLE_UNKNOWN. Devs should never need this enum.

Bug: 78910582
Bug: 79245656
Test: robotests
Change-Id: I58821a6cfd6134b3b351657b6edf5f74ead00643

src/com/android/settings/backup/AutoRestorePreferenceController.java

@@ -46,7 +46,7 @@ public class AutoRestorePreferenceController extends TogglePreferenceController
             return DISABLED_FOR_USER;
         }
         if (PrivacySettingsUtils.isInvisibleKey(mContext, PrivacySettingsUtils.AUTO_RESTORE)) {
-            return DISABLED_UNSUPPORTED;
+            return UNSUPPORTED_ON_DEVICE;
         }
         return AVAILABLE;
     }

src/com/android/settings/backup/BackupDataPreferenceController.java

@@ -37,7 +37,7 @@ public class BackupDataPreferenceController extends BasePreferenceController {
             return DISABLED_FOR_USER;
         }
         if (PrivacySettingsUtils.isInvisibleKey(mContext, PrivacySettingsUtils.BACKUP_DATA)) {
-            return DISABLED_UNSUPPORTED;
+            return UNSUPPORTED_ON_DEVICE;
         }
         return AVAILABLE;
     }

src/com/android/settings/backup/BackupInactivePreferenceController.java

@@ -32,7 +32,7 @@ public class BackupInactivePreferenceController extends BasePreferenceController
             return DISABLED_FOR_USER;
         }
         if (PrivacySettingsUtils.isInvisibleKey(mContext, PrivacySettingsUtils.BACKUP_INACTIVE)) {
-            return DISABLED_UNSUPPORTED;
+            return UNSUPPORTED_ON_DEVICE;
         }
         return AVAILABLE;
     }

src/com/android/settings/backup/BackupSettingsActivityPreferenceController.java

@@ -41,7 +41,7 @@ public class BackupSettingsActivityPreferenceController extends BasePreferenceCo
     public int getAvailabilityStatus() {
         return mUm.isAdminUser()
                 ? AVAILABLE
-                : DISABLED_UNSUPPORTED;
+                : UNSUPPORTED_ON_DEVICE;
     }
 
     @Override

src/com/android/settings/backup/ConfigureAccountPreferenceController.java

@@ -38,7 +38,7 @@ public class ConfigureAccountPreferenceController extends BasePreferenceControll
             return DISABLED_FOR_USER;
         }
         if (PrivacySettingsUtils.isInvisibleKey(mContext, PrivacySettingsUtils.CONFIGURE_ACCOUNT)) {
-            return DISABLED_UNSUPPORTED;
+            return UNSUPPORTED_ON_DEVICE;
         }
         return AVAILABLE;
     }

src/com/android/settings/backup/DataManagementPreferenceController.java

@@ -37,7 +37,7 @@ public class DataManagementPreferenceController extends BasePreferenceController
         }
         boolean manageEnabled = (mPSCD.getManageIntent() != null) && mPSCD.isBackupEnabled();
         if (!manageEnabled) {
-            return DISABLED_UNSUPPORTED;
+            return UNSUPPORTED_ON_DEVICE;
         }
         return AVAILABLE;
     }