Remove unused hidden API UpdateLock

Bug: 137202333
Test: Make
Change-Id: Ib20219a47f27095bfce78a43aceeed2f5a9fda50
diff --git a/src/com/android/phone/PhoneGlobals.java b/src/com/android/phone/PhoneGlobals.java
index 29fff0d..8094812 100644
--- a/src/com/android/phone/PhoneGlobals.java
+++ b/src/com/android/phone/PhoneGlobals.java
@@ -39,7 +39,6 @@
 import android.os.PowerManager;
 import android.os.SystemClock;
 import android.os.SystemProperties;
-import android.os.UpdateLock;
 import android.os.UserManager;
 import android.preference.PreferenceManager;
 import android.provider.Settings;
@@ -187,8 +186,6 @@
     private PowerManager.WakeLock mPartialWakeLock;
     private KeyguardManager mKeyguardManager;
 
-    private UpdateLock mUpdateLock;
-
     private int mDefaultDataSubId = SubscriptionManager.INVALID_SUBSCRIPTION_ID;
     private final LocalLog mDataRoamingNotifLog = new LocalLog(50);
 
@@ -347,12 +344,6 @@
 
             mKeyguardManager = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);
 
-            // Get UpdateLock to suppress system-update related events (e.g. dialog show-up)
-            // during phone calls.
-            mUpdateLock = new UpdateLock("phone");
-
-            if (DBG) Log.d(LOG_TAG, "onCreate: mUpdateLock: " + mUpdateLock);
-
             // Create the CallerInfoCache singleton, which remembers custom ring tone and
             // send-to-voicemail settings.
             //