[mlir][spirv] fix Bazel build of Passes.h

[cota]

Summary

I cannot repro this with CMake, but on Bazel this is failing with

error: incomplete result type 'mlir::spirv::TargetEnvAttr' in function definition
[...]
note: in instantiation of member function 'std::function<mlir::spirv::TargetEnvAttr (mlir::spirv::ModuleOp)>::function' requested here
createUnifyAliasedResourcePass(GetTargetEnvFn getTargetEnv = nullptr);

mlir/include/mlir/Dialect/SPIRV/Transforms/Passes.h

 //===- Passes.h - SPIR-V pass entry points ----------------------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // This header file defines prototypes that expose pass constructors.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef MLIR_DIALECT_SPIRV_TRANSFORMS_PASSES_H_
 #define MLIR_DIALECT_SPIRV_TRANSFORMS_PASSES_H_
 
+#include "mlir/Dialect/SPIRV/IR/SPIRVAttributes.h"
 #include "mlir/Pass/Pass.h"
 
 namespace mlir {
 
 class ModuleOp;
 
 namespace spirv {
 
 class ModuleOp;
-class TargetEnvAttr;
 
 //===----------------------------------------------------------------------===//
 // Passes
 //===----------------------------------------------------------------------===//
 
 #define GEN_PASS_DECL
 #include "mlir/Dialect/SPIRV/Transforms/Passes.h.inc"