Don't auto-focus text fields in hotspot dialog

Instead focus the parent, so that the fields can be seen on smaller
screens before editing.

Bug: 19095568
Change-Id: Ifeacce3ed64c370ff414e81bd4d25c5d0b26712c

res/layout/wifi_ap_dialog.xml

@@ -22,6 +22,8 @@
     <LinearLayout
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
+            android:descendantFocusability="beforeDescendants"
+            android:focusableInTouchMode="true"
             android:orientation="vertical">
 
         <LinearLayout android:id="@+id/info"