deps: point ggml to Adreno fused qknorm rope

[happyyzy]

Summary

Updates the ggml submodule pointer to the local staging branch with the fused Adreno qknorm/RoPE OpenCL path.

Corresponding ggml PR: happyyzy/ggml#1.

Notes

This PR is stacked on #3 and only updates the dependency pointer.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Point ggml at a fetchable commit

This updates the ggml gitlink to 7658879, but .gitmodules still fetches the submodule from https://github.com/leejet/ggml.git; that repository does not contain this commit while it exists in the happyyzy/ggml fork referenced by the commit message. In a fresh checkout, git submodule update --init ggml will fail unless the user already has that object locally, so builds from this revision cannot reliably fetch dependencies. Please either push/merge the ggml commit to the configured submodule remote or update the submodule URL to a remote that contains it.

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