Enable host libbcc even on unbundled builds

Because host bcc isn't disabled regardless of unbundled builds.

Test: build with TARGET_BUILD_UNBUNDLED_IMAGE
Change-Id: I42aabaad3dc785638836afb38443473406843026
diff --git a/lib/Android.bp b/lib/Android.bp
index 7c53f60..6ddc652 100644
--- a/lib/Android.bp
+++ b/lib/Android.bp
@@ -80,13 +80,12 @@
                 "libdl",
                 "liblog",
             ],
-        },
-    },
-
-    product_variables: {
-        unbundled_build: {
-            // Don't build in unbundled branches
-            enabled: false,
+            product_variables: {
+                unbundled_build: {
+                    // Don't build in unbundled branches
+                    enabled: false,
+                },
+            },
         },
     },
 }