message: Fix ROCM build by removing optional keyword from protobuf definition
diff: @@ -171,15 +171,15 @@ message TpuCompilationRequestProto {
  repeated TensorProto guaranteed_constants = 7;
  // MLIR module definition.
  - optional string mlir_module = 8;
  + string mlir_module = 8;
  // A set of named functions used as the input to lowering to Hlo when mlir is
  // not used.
  - optional FunctionDefLibrary fdef_lib = 9;
  + FunctionDefLibrary fdef_lib = 9;
  // The version of the graph definition used to lower TF function to Hlo.
  - optional int32 graph_def_version = 10;
  + int32 graph_def_version = 10;
  // Function containing the computation to compile.
  - optional NameAttrList function = 11;
  + NameAttrList function = 11;
  }
  