model : add Granite Hybrid nano types (#16896)

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

src/llama-model.cpp

@@ -1898,7 +1898,8 @@ void llama_model::load_hparams(llama_model_loader & ml) {
                 ml.get_key(LLM_KV_ATTENTION_LAYERNORM_RMS_EPS, hparams.f_norm_rms_eps);
 
                 switch (hparams.n_embd) {
-                    case 1536: type = LLM_TYPE_7B_A1B; break;
+                    case 768: type = LLM_TYPE_350M; break;
+                    case 1536: type = (hparams.n_embd == 2048 ? LLM_TYPE_7B_A1B : LLM_TYPE_1B); break;
                     case 2048: case 2560: type = LLM_TYPE_3B; break;
                     case 4096: type = LLM_TYPE_32B; break;
                     default: type = LLM_TYPE_UNKNOWN;