Disable vr_hwc module.

The module is subject to deletion. Disable it to prevent it from
building.

Test: TH
Bug: 170681929
Change-Id: I748a7edb0be148036a6bb3d19bb40f5f5b42b599
diff --git a/services/vr/hardware_composer/Android.bp b/services/vr/hardware_composer/Android.bp
index 3728731..69754f3 100644
--- a/services/vr/hardware_composer/Android.bp
+++ b/services/vr/hardware_composer/Android.bp
@@ -99,6 +99,7 @@
 
 cc_binary {
     name: "vr_hwc",
+    enabled: false,
     system_ext_specific: true,
     vintf_fragments: ["manifest_vr_hwc.xml"],
     srcs: [