SnapdragonCamera: Fix lockscreen Camera landscape display abnormal

When rotating orientation priview view configuration changed and
re-layout. Not only cause screen display abnormal, but also make
latency in UI.
Add "portrait only" property on camera activity can avoid these
problems. And Camera UI can deal rotating orientation by its own
way which is more stabe and effective.

Change-Id: Id84a50de271c511c8c4b2a46a1de27b8eeabd037
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
old mode 100644
new mode 100755
index 53ebaa3..37ce25f
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -121,6 +121,7 @@
             android:label="@string/snapcam_app_name"
             android:launchMode="singleInstance"
             android:logo="@mipmap/ic_launcher_gallery"
+            android:screenOrientation="portrait"
             android:taskAffinity="com.android.camera.SecureCameraActivity"
             android:theme="@style/Theme.Camera"
             android:windowSoftInputMode="stateAlwaysHidden|adjustPan" >