llama : add guard for K/V rotation input when buffer is unallocated (#25215)

llm_graph_input_attn_kvset_input and llm_graph_input_attn_kv_iswaset_input call set_input_k_rot / set_input_v_rot whenever the rotation tensor pointer is non-null, but the tensor's buffer can be unallocated (NULL) when a graph only stores K/V without attending -- e.g. DFlash speculative decoding's KV-injection pass. set_input_k_rot then calls ggml_backend_buffer_is_host() on a NULL buffer and aborts with GGML_ASSERT(buffer).

Guard the four k_rot/v_rot inputs with the same "&& ->buffer" check that the adjacent kq_mask inputs already use in these two functions. When the buffer is unallocated there is no data to upload, so skipping is correct.

Fixes #25191

Signed-off-by: liminfei-amd [email protected]