libbinder: on host

The usecase is unit testing things which implement binder interfaces.

Bug: 124524556
Test: TH runs all relevant unit tests
Change-Id: I8caba1290da6d0354a7736a26d1dad7b6ab852e6
diff --git a/libs/binderthreadstate/Android.bp b/libs/binderthreadstate/Android.bp
index 512b069..ee1a6a4 100644
--- a/libs/binderthreadstate/Android.bp
+++ b/libs/binderthreadstate/Android.bp
@@ -20,6 +20,8 @@
         enabled: true,
         support_system_process: true,
     },
+    host_supported: true,
+
     srcs: [
         "IPCThreadStateBase.cpp",
     ],