UI fixes for tablets

1. Center the clock on Xoom and large tablets. Fix b/5579000

2. Correctly remove the emergency call button if the device (*cough*
   Nakasi *cough*) does not have telephone capability.

Change-Id: Ib7552dc35392a1b9d6c0381c6167949e2b163ddc

res/layout-sw600dp/crypt_keeper_password_entry.xml

@@ -16,7 +16,8 @@
 ** limitations under the License.
 */
 -->
-<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="vertical"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
 >
@@ -25,7 +26,7 @@
     <RelativeLayout
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:layout_centerHorizontal="true"
+        android:layout_gravity="center_horizontal"
         android:layout_marginTop="318dip"
     >
         <ImageView android:id="@+id/encroid"
@@ -53,10 +54,11 @@
             android:layout_width="320dip"
             android:layout_toRightOf="@+id/passwordLabel"
             android:layout_marginTop="26dip"
+            android:layout_centerVertical="true"
             android:orientation="horizontal"
         >
             <include layout="@layout/crypt_keeper_password_field" />
         </LinearLayout>
     </RelativeLayout>
 
-</RelativeLayout>
+</LinearLayout>

res/layout/crypt_keeper_status.xml

@@ -23,6 +23,7 @@
     android:orientation="vertical"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
+    android:layout_gravity="center_horizontal"
 >
 
     <com.android.internal.widget.DigitalClock android:id="@+id/time"
@@ -31,6 +32,7 @@
         android:layout_alignParentTop="true"
         android:layout_alignParentLeft="true"
         android:layout_marginTop="8dip"
+        android:layout_gravity="center"
         android:layout_marginBottom="8dip"
         >