Add the sepolicy.version file to the root directory.

Bug: 8841348
Change-Id: I9b4b096eb11b332a4c2c3cb8df179cf611a7ff43
diff --git a/target/product/embedded.mk b/target/product/embedded.mk
index 0830101..a3047e3 100644
--- a/target/product/embedded.mk
+++ b/target/product/embedded.mk
@@ -72,5 +72,8 @@
     mac_permissions.xml
 
 PRODUCT_COPY_FILES += \
+    external/sepolicy/sepolicy.version:root/sepolicy.version
+
+PRODUCT_COPY_FILES += \
     system/core/rootdir/init.usb.rc:root/init.usb.rc \
     system/core/rootdir/init.trace.rc:root/init.trace.rc \