Use fuzz_config to config fuzzing size

Do not hard code the size in the source code.
Use fuzz_config in Android.bp to do that.

Test: atest servicemanager_test
Bug: 232439428
Bug: 240318902
Change-Id: I03c186bc6eed60f1368bfcb9e0a21dbd5c4c1c11
diff --git a/cmds/servicemanager/Android.bp b/cmds/servicemanager/Android.bp
index 25bd9a3..edeb2a4 100644
--- a/cmds/servicemanager/Android.bp
+++ b/cmds/servicemanager/Android.bp
@@ -113,6 +113,9 @@
     },
     srcs: ["ServiceManagerFuzzer.cpp"],
     fuzz_config: {
+        libfuzzer_options: [
+            "max_len=50000",
+        ],
         cc: [
             "smoreland@google.com",
             "waghpawan@google.com",