IMS-VT: Volume boost icon is not able to enable

When primary call banner shown Volume boost icon
is visible in background but not able enable or
disable.
Moved Volume boost icon to center horizontal.

Change-Id: I5ced9ca2c2e8984913fce49afc6e4e339a5e59a1
CRs-Fixed: 1089980
diff --git a/InCallUI/res/layout-w500dp-land/call_card_fragment.xml b/InCallUI/res/layout-w500dp-land/call_card_fragment.xml
index 89b7fb5..343c4da 100644
--- a/InCallUI/res/layout-w500dp-land/call_card_fragment.xml
+++ b/InCallUI/res/layout-w500dp-land/call_card_fragment.xml
@@ -120,6 +120,7 @@
     </RelativeLayout>
 
     <LinearLayout
+        android:id="@+id/manage_conference_call"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:orientation="vertical"
@@ -130,16 +131,18 @@
             android:layout_height="wrap_content"
             android:elevation="5dp"
             android:layout_alignParentBottom="true"/>
-
-        <!-- Volume boost and Volume enhancements in-call UI -->
-        <ImageButton android:id="@+id/volumeBoost"
-            android:layout_width="80dp"
-            android:layout_height="80dp"
-            android:visibility="gone"
-            android:soundEffectsEnabled="false"
-            android:background="@drawable/vb_normal"/>
     </LinearLayout>
 
+    <!-- Volume boost and Volume enhancements in-call UI -->
+    <ImageButton android:id="@+id/volumeBoost"
+        android:layout_width="80dp"
+        android:layout_height="80dp"
+        android:layout_toEndOf="@id/primary_call_info_container"
+        android:layout_below="@id/manage_conference_call"
+        android:visibility="gone"
+        android:soundEffectsEnabled="false"
+        android:background="@drawable/vb_normal"/>
+
     <!-- Secondary "Call info" block, for the background ("on hold") call. -->
     <include layout="@layout/secondary_call_info"
              android:id="@+id/secondary_call_info"