Remove portrait support in SetupWizard

We support sensorLandscape for a moment.

See also I45e30c652feab1d30c4f0379379f8ca4e455fa02

- Use sensorLandscape instead of default
- Modify paddings in default xmls to layout landscape stuffs
  correctly

Change-Id: Ife03de69e4d1d2d898cd0e8de3cefd733aea8f19
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index bf7346c..86903ed 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -136,6 +136,7 @@
                   android:theme="@android:style/Theme.Holo.NoActionBar"
                   android:windowBackground="@drawable/setups_bg_default"
                   android:clearTaskOnLaunch="true"
+                  android:screenOrientation="sensorLandscape"
                   android:exported="true" />
 
         <activity-alias android:name=".wifi.AdvancedSettings"