Revert "WifiService: Remove usage of NotificationChannel.setBlockableSystem"

This reverts commit 6bec9adffcfc7bb19d13121dac1451745c49f00d.

Reason for revert: setBlockableSystem() was made a @SystemApi in b/138401571

Bug: 145921908
Change-Id: I94ed171bb08a244a67dd263a2e4bfb6cf23ce1f1
Test: Compiles

1 files changed, 2 insertions, 0 deletions

diff --git a/service/java/com/android/server/wifi/WifiService.java b/service/java/com/android/server/wifi/WifiService.java
index a6a32bb6e..34f1a76b7 100644
--- a/service/java/com/android/server/wifi/WifiService.java
+++ b/service/java/com/android/server/wifi/WifiService.java
@@ -94,6 +94,7 @@ public final class WifiService extends SystemService {
                 ctx.getResources().getString(
                         android.R.string.notification_channel_network_alerts),
                 NotificationManager.IMPORTANCE_HIGH);
+        networkAlertsChannel.setBlockableSystem(true);
         channelsList.add(networkAlertsChannel);
 
         final NotificationChannel networkAvailable = new NotificationChannel(
@@ -101,6 +102,7 @@ public final class WifiService extends SystemService {
                 ctx.getResources().getString(
                         android.R.string.notification_channel_network_available),
                 NotificationManager.IMPORTANCE_LOW);
+        networkAvailable.setBlockableSystem(true);
         channelsList.add(networkAvailable);
 
         nm.createNotificationChannels(channelsList);