Request focus in wifi screen in add network and secure wifi

Request focus from parent view in controller. Based on framework
patch, it can be placed in a parent and focus will go to whatever view
is the default focusable in that hierarchy.

Fixes: 68776177
Fixes: 72882629
Test: RunSettingsRobotests and Manual test
Change-Id: I3bcdc4ec814f68079a00e40435f46bdfa53f4425

res/layout/wifi_dialog.xml

@@ -21,6 +21,7 @@
         android:scrollIndicators="top|bottom">
 
     <LinearLayout
+            android:id="@+id/l_wifidialog"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:orientation="vertical"