sepolicy: Add new crypto type ro.crypto.type=managed

This type is used when device encryption is managed by the host system.
(e.g. ARC++)
Please see b/136127632#comment10 for the reason why we introduce this.

Bug: 169207445
Test: m
Change-Id: I8c4eaa57389e591b2c520b59bb95408d43daf22c
diff --git a/private/property_contexts b/private/property_contexts
index 7f97281..596a178 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -902,7 +902,7 @@
 ro.product.property_source_order u:object_r:build_config_prop:s0 exact string
 
 ro.crypto.state u:object_r:vold_status_prop:s0 exact enum encrypted unencrypted unsupported
-ro.crypto.type  u:object_r:vold_status_prop:s0 exact enum block file none
+ro.crypto.type  u:object_r:vold_status_prop:s0 exact enum block file managed none
 
 ro.property_service.version u:object_r:property_service_version_prop:s0 exact int