[TFLite] Fix cmake build kernel test fail when `-DTFLITE_ENABLE_GPU=OFF`
This PR is the revised version of https://github.com/tensorflow/tensorflow/pull/61473.
@grantjensen 
- Problem:
Using CMake to build the TFLite kernel test will fail in linking stage when `-DTFLITE_ENABLE_GPU=OFF`

- Log:
```
ld: libtensorflow-lite-test-base.a(op_version.cc.o): in function `.LBB1_18':
op_version.cc:(.text._ZN6tflite15UpdateOpVersionEPh+0x14c): undefined reference to `tflite::GetOpSignature(tflite::OperatorCode const*, tflite::Operator const*, tflite::SubGraph const*, tflite::Model const*)'
clang++: rror: linker command failed with exit code 1 (use -v to see invocation)
```

- Solution:
Add `versioning/op_signature.cc` to TEST_FRAMEWORK_SRC if `-DTFLITE_ENABLE_GPU=OFF`. `versioning/op_version.cc` depends on `versioning/op_signature.cc` because of using GetOpSignature().
We don't need to add `versioning/op_signature.cc` to TEST_FRAMEWORK_SRC if `-DTFLITE_ENABLE_GPU=ON`. Because `versioning/op_signature.cc` is appended in `TFLITE_DELEGATES_GPU_SRCS`, it makes `tensorflow-lite.a` define `GetOpSignature`.