Fix amalgamated build

Move libperfetto_client_experimental one level up
and point gen_amalgamated to it.

Test: manual. Works, see https://github.com/primiano/perfetto-sdk
Bug: 132678367
Change-Id: If542ffdf9eb303334eddb6f7b4eabca53f7c8459
diff --git a/Android.bp b/Android.bp
index 6e7f7d8..303d83e 100644
--- a/Android.bp
+++ b/Android.bp
@@ -888,6 +888,7 @@
   ],
   static_libs: [
     "libgmock",
+    "libperfetto_client_experimental",
     "perfetto_src_tracing_ipc",
   ],
   generated_headers: [