Fix issue #2395667: Pull LW Picker apk from Droid build

My tricky stuff to add the live wallpaper feature if the live wallpaper
picker is included in the system was too tricky for me, and doesn't work.
It just always got added.  Remove this for now, requiring that products
explicitly include this feature definition.
diff --git a/Android.mk b/Android.mk
index a682ef3..0f73b50 100644
--- a/Android.mk
+++ b/Android.mk
@@ -21,7 +21,7 @@
 
 LOCAL_MODULE := android.software.live_wallpaper.xml
 
-LOCAL_MODULE_TAGS := user
+#LOCAL_MODULE_TAGS := user
 
 LOCAL_MODULE_CLASS := ETC
 
@@ -31,7 +31,10 @@
 
 LOCAL_SRC_FILES := $(LOCAL_MODULE)
 
-include $(BUILD_PREBUILT)
+# XXX the intention is that this file be copied automatically when
+# LiveWallpaperPicker is being bundled with a system.  Unfortunately
+# it isn't working correctly (it always gets copied).
+#include $(BUILD_PREBUILT)
 
 ########################
 include $(CLEAR_VARS)
@@ -39,7 +42,7 @@
 #LOCAL_MODULE_TAGS := user
 
 LOCAL_SRC_FILES := $(call all-subdir-java-files)
-LOCAL_REQUIRES_MODULE := android.software.live_wallpaper.xml
+#LOCAL_REQUIRES_MODULE := android.software.live_wallpaper.xml
 
 LOCAL_PACKAGE_NAME := LiveWallpapersPicker
 LOCAL_CERTIFICATE := platform