cerebras template update for memory (#792)

# What does this PR do?

- we no longer have meta-reference as memory provider, update cerebras
template


## Test Plan

```
python llama_stack/scripts/distro_codegen.py
```

## Sources

Please link relevant resources if necessary.


## Before submitting

- [ ] This PR fixes a typo or improves the docs (you can dismiss the
other checks if that's the case).
- [ ] Ran pre-commit to handle lint / formatting issues.
- [ ] Read the [contributor
guideline](https://github.com/meta-llama/llama-stack/blob/main/CONTRIBUTING.md),
      Pull Request section?
- [ ] Updated relevant documentation.
- [ ] Wrote necessary unit or integration tests.

llama_stack/templates/meta-reference-quantized-gpu/build.yaml

@@ -1,5 +1,4 @@
 version: '2'
-name: meta-reference-quantized-gpu
 distribution_spec:
   description: Use Meta Reference with fp8, int4 quantization for running LLM inference
   providers:

llama_stack/templates/meta-reference-quantized-gpu/run.yaml

@@ -1,6 +1,5 @@
 version: '2'
 image_name: meta-reference-quantized-gpu
-conda_env: meta-reference-quantized-gpu
 apis:
 - agents
 - datasetio