[temporary] SystemUI: add mBatteryDead to KeyguardIndicationController

In the stock OS image for July 2025, a boolean mBatteryDead field was
added to com.android.systemui.statusbar.KeyguardIndicationController.
There are no other changes to this AOSP class; everything else involving
mBatteryDead is done in the Google-specific
com.google.android.systemui.statusbar.KeyguardIndicationControllerGoogle
class, and we handle in a subsequent commit.

It's likely this will conflict with future AOSP tags since this is a
modification to an AOSP class, hence the [temporary] tag. This commit
should be dropped when the tags get pushed and this field is added to
the class upstream.

Author: inthewaves

packages/SystemUI/src/com/android/systemui/statusbar/KeyguardIndicationController.java

@@ -226,6 +226,8 @@ public class KeyguardIndicationController {
     private int mBatteryLevel = -1;
     private boolean mBatteryPresent = true;
     protected long mChargingTimeRemaining;
+    /** Added in July 2025 patch, might conflict when tags get pushed */
+    protected boolean mBatteryDead;
     private Pair<String, BiometricSourceType> mBiometricErrorMessageToShowOnScreenOn;
     private Set<Integer> mCoExFaceAcquisitionMsgIdsToShow;
     private final FaceHelpMessageDeferral mFaceAcquiredMessageDeferral;