Add a property to reflect the app debuggability

Set a build-time config to declare app debuggability that is used as
input to DICE and by apps, such as compos, that make decisions based on
this state. This will make it easier to tweak the definition of
debuggability and keep it consistent across dependents.

Bug: 219740340
Test: atest ComposHostTestCases
Test: atest MicrodroidTests
Change-Id: I770ae615a958dd6939925c400336a2550a3d950d
diff --git a/microdroid/bootconfig.normal b/microdroid/bootconfig.normal
index 4378dbc..708d64b 100644
--- a/microdroid/bootconfig.normal
+++ b/microdroid/bootconfig.normal
@@ -1,3 +1,6 @@
+# The app is not debuggable.
+androidboot.microdroid.app_debuggable=0
+
 # ro.debuggable is off
 androidboot.microdroid.debuggable=0