[DO NOT MERGE] Revert "Fix KeyStoreClientImpl::doesKeyExist to return correct result"

Bug:117993149
This reverts commit cb77797d66523188e0b9929274b290c0c8db3083.

Reason for revert: removing this from May QPR & pi-dev.

Change-Id: I55eb358bd8ea8c82521ac07dbf37f4895fe3e8e9
(cherry picked from commit fab0e5d8e06fe23864c4f89df89271f8a55715a8)
diff --git a/keystore/keystore_client_impl.cpp b/keystore/keystore_client_impl.cpp
index 994e3f2..6d998ad 100644
--- a/keystore/keystore_client_impl.cpp
+++ b/keystore/keystore_client_impl.cpp
@@ -366,7 +366,7 @@
     int32_t result;
     auto binder_result = keystore_->exist(key_name16, kDefaultUID, &result);
     if (!binder_result.isOk()) return false;  // binder error
-    return result == static_cast<int32_t>(ResponseCode::NO_ERROR);
+    return result;
 }
 
 bool KeystoreClientImpl::listKeys(const std::string& prefix,