Change com.android.runtime.host to be an installable test_apex

We need this module to actually be built and installed to the
out-directory but we don't want it to affect the libraries installed
on actual devices so make it a test_apex.

Bug: 123892969
Bug: 123892969
Test: Build and boot
Test: ./art/test/testrunner/run_build_test_target.py -j72 art-linux-bionic-x64-zipapex
Change-Id: I9950698863fb280cbdc6dfa4743985c0217d2e7c
diff --git a/build/apex/Android.bp b/build/apex/Android.bp
index ad94b45..1bf41e7 100644
--- a/build/apex/Android.bp
+++ b/build/apex/Android.bp
@@ -196,10 +196,9 @@
 // because binaries have different multilib classes and 'multilib: {}' isn't
 // supported by target: { ... }.
 // See b/120617876 for more information.
-art_apex {
+art_apex_test {
     name: "com.android.runtime.host",
     compile_multilib: "both",
-    installable: false,
     payload_type: "zip",
     host_supported: true,
     device_supported: false,