Handle PayloadConfig in Microdroid

Either read the config from JSON or build it from the values in
metadata.

In the latter case, include a hash of the config values in the DICE
config_desc instead of the config path.

Bug: 243513572
Test: atest MicrodroidTests
Change-Id: Ifa1c5dfa17d11a1589621fa265709735d73d4f61
diff --git a/virtualizationservice/src/aidl.rs b/virtualizationservice/src/aidl.rs
index 22418b9..563fab0 100644
--- a/virtualizationservice/src/aidl.rs
+++ b/virtualizationservice/src/aidl.rs
@@ -667,7 +667,7 @@
         apexes: vec![],
         extra_apks: vec![],
         prefer_staged: false,
-        export_tombstones: payload_config.exportTombstones,
+        export_tombstones: false,
         enable_authfs: false,
     }
 }