graph : make FA compatible with MLA + add initial Metal kernels (#12953)

* graph : make mla compatible with FA

* metal : add exp FA kernels for DeepSeek models

ggml-ci

* llama : minor naming updates

ggml-ci

* ggml : disable FA for DS head sizes

* tests : add FA tests for MLA shapes

ggml-ci

ggml/src/ggml-vulkan/ggml-vulkan.cpp

@@ -9261,6 +9261,7 @@ static bool ggml_backend_vk_device_supports_op(ggml_backend_dev_t dev, const ggm
                 case 112:
                 case 128:
                 case 256:
+                case 575: // DeepSeek MLA
                     break;
                 default:
                     return false;