sepolicy: Allow relabeling after wallpaper change

Change-Id: I89220fae961f483dad8b92faaee9ed8fe6c8a7cf
diff --git a/sepolicy/sepolicy.mk b/sepolicy/sepolicy.mk
index b50ec1d..a469015 100644
--- a/sepolicy/sepolicy.mk
+++ b/sepolicy/sepolicy.mk
@@ -14,6 +14,7 @@
     seapp_contexts \
     installd.te \
     netd.te \
+    system.te \
     ueventd.te \
     vold.te \
     mac_permissions.xml
diff --git a/sepolicy/system.te b/sepolicy/system.te
new file mode 100644
index 0000000..acf8fed
--- /dev/null
+++ b/sepolicy/system.te
@@ -0,0 +1 @@
+allow system wallpaper_file:file relabelto;