tp: strip trace processor on Android builds

Keep only the symbols not the debug info. This should significantly reduce
the size of builds.

Change-Id: I91b1a4ca8fe7780722d1b8291b34f5504fe43016
diff --git a/Android.bp b/Android.bp
index c6c8505..9e60331 100644
--- a/Android.bp
+++ b/Android.bp
@@ -7590,6 +7590,9 @@
       "sdk_repo",
     ],
   },
+  strip: {
+    keep_symbols: true,
+  },
   stl: "libc++_static",
 }