sepolicy: label vendor_service_contexts as vendor_service_contexts_file

Due to AIDL HAL introduction, vendors can publish services
with servicemanager. vendor_service_contexts is labeled as
vendor_service_contexts_file, not nonplat_service_contexts_file.
And pack it to vendor partition.

Bug: 154066722

Test: check file label
Change-Id: Ic74b12e4c8e60079c0872b6c27ab2f018fb43969
diff --git a/Android.mk b/Android.mk
index 37dee73..b667fd2 100644
--- a/Android.mk
+++ b/Android.mk
@@ -346,6 +346,7 @@
     vendor_property_contexts \
     vendor_property_contexts_test \
     vendor_seapp_contexts \
+    vendor_service_contexts \
     vendor_hwservice_contexts \
     vendor_hwservice_contexts_test \
     vndservice_contexts \