Add default corpus directory

Test: m vold_native_service_fuzzer
Test: adb shell /data/fuzz/x86_64/vold_native_service_fuzzer/vold_native_service_fuzzer /data/fuzz/x86_64/vold_native_service_fuzzer/corpu
Bug: 295220956
Change-Id: I7c6d1a38962a2c997e0c0d05ca9a2a4bb96f3001

Author: waghpawan

libs/binder/tests/Android.bp

@@ -888,6 +888,7 @@ cc_defaults {
             enabled: false,
         },
     },
+    corpus: ["corpus/*"],
     fuzz_config: {
         cc: [
             "smoreland@google.com",