perfetto: add ability to override upload limit flag on debuggable builds

This allows for us to override the failsafe which limits how much data
we can upload per day on userdebug builds.

Bug: 80129651
Change-Id: Ie683801bbb64ee2017a13a3e39e1969c4cb08b24
diff --git a/Android.bp b/Android.bp
index 501bc8e..47c381f 100644
--- a/Android.bp
+++ b/Android.bp
@@ -248,6 +248,11 @@
   local_include_dirs: [
     "include",
   ],
+  product_variables: {
+    debuggable: {
+      cflags: ["-DPERFETTO_BUILD_WITH_ANDROID_USERDEBUG"],
+    },
+  },
 }
 
 // GN target: //:perfetto_integrationtests