Fix 3382123: Set default state of LockScreen portrait kb

This sets the default state of the portrait keyboard to
"gone" to agree with the landscape keyboard.

Change-Id: I1e6a21b07c27ef739bfde4558b958c48b4fc56df

core/res/res/layout-xlarge/keyguard_screen_password_portrait.xml

@@ -74,6 +74,7 @@
             android:layout_height="230dip"
             android:background="#00000000"
             android:keyBackground="@drawable/btn_keyboard_key_fulltrans"
+            android:visibility="gone"
         />
 
         <!-- emergency call button -->