Run microdroid in protected mode

... but run in non-protected mode when

(1) on non-aarch64 architectures, or
(2) debug level is set to FULL

Bug: 210803811
Test: watch TH for all our tests
Change-Id: I4d33be8d560b14c2c2e3ce50605298ad58fbf42d
diff --git a/microdroid/microdroid.json b/microdroid/microdroid.json
index 211bae4..8496052 100644
--- a/microdroid/microdroid.json
+++ b/microdroid/microdroid.json
@@ -33,5 +33,6 @@
       "writable": true
     }
   ],
-  "memory_mib": 2048
+  "memory_mib": 2048,
+  "protected": true
 }