Add PendingIntent immutable flag

package com.android.systemui.power;

import static android.app.PendingIntent.FLAG_IMMUTABLE;

import android.app.KeyguardManager;

import android.app.Notification;

import android.app.NotificationManager;

    }

    private PendingIntent pendingBroadcast(String action) {

        return PendingIntent.getBroadcastAsUser(mContext, 0,

                new Intent(action).setPackage(mContext.getPackageName())

        return PendingIntent.getBroadcastAsUser(

                mContext,

                0 /* request code */,

                new Intent(action)

                        .setPackage(mContext.getPackageName())

                        .setFlags(Intent.FLAG_RECEIVER_FOREGROUND),

                0, UserHandle.CURRENT);

                FLAG_IMMUTABLE /* flags */,

                UserHandle.CURRENT);

    }

    private static Intent settings(String action) {