Separate system_ext_seapp_contexts out of system sepolicy.

Bug: 137712473
Test: boot crosshatch
Change-Id: I2c2acbcf234861feb39834c867a4eb74c506692d
diff --git a/Android.mk b/Android.mk
index d4f09c4..092d568 100644
--- a/Android.mk
+++ b/Android.mk
@@ -317,6 +317,7 @@
     system_ext_file_contexts \
     system_ext_file_contexts_test \
     system_ext_mapping_file \
+    system_ext_seapp_contexts \
 
 endif