recovery: install system_ext file_contexts and property_contexts

System Ext partition is not mounted in recovery mode. Install
system_ext_file_contexts and system_ext_property_contexts into
rootdir for recovery. This is similar to how we deal with system,
product, vendor, odm *_contexts files.

Bug: 137712473
Test: m bootimage for pixel 2, system_ext_file_contexts and
      system-ext_property_contexts appear in $OUT/recovery/root/
Change-Id: I94b965d775e727fbbe26c8b715bbce3ca6179fa7
diff --git a/core/Makefile b/core/Makefile
index 0a990cb..addb4eb 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -1733,8 +1733,10 @@
 recovery_sepolicy := \
     $(TARGET_RECOVERY_ROOT_OUT)/sepolicy \
     $(TARGET_RECOVERY_ROOT_OUT)/plat_file_contexts \
-    $(TARGET_RECOVERY_ROOT_OUT)/vendor_file_contexts \
     $(TARGET_RECOVERY_ROOT_OUT)/plat_property_contexts \
+    $(TARGET_RECOVERY_ROOT_OUT)/system_ext_file_contexts \
+    $(TARGET_RECOVERY_ROOT_OUT)/system_ext_property_contexts \
+    $(TARGET_RECOVERY_ROOT_OUT)/vendor_file_contexts \
     $(TARGET_RECOVERY_ROOT_OUT)/vendor_property_contexts \
     $(TARGET_RECOVERY_ROOT_OUT)/odm_file_contexts \
     $(TARGET_RECOVERY_ROOT_OUT)/odm_property_contexts \