b4425

llama : rename missed batch params/vars to ubatch (#10059)

This commit renames the `batch` parameter to `ubatch` in the
`llama_kv_cache_find_slot`, `llm_build_inp_embd`, and
`llm_build_mamba` functions.

The motivation for this is that this should have been done as part of
Commit 19d900a7565b8f6b0a708836a57d26966cb9efe2 ("llama : rename batch
to ubatch (#9950)") but for some reason I missed these functions in
that commit and only noticed them now (sorry).