cont : fix supports_op

Author: ggerganov

ggml/src/ggml-metal/ggml-metal.m

@@ -2028,6 +2028,7 @@ static bool ggml_metal_supports_op(const struct ggml_backend_metal_device_contex
             return has_simdgroup_mm; // TODO: over-restricted for vec-kernels
         case GGML_OP_SSM_CONV:
         case GGML_OP_SSM_SCAN:
+            return has_simdgroup_reduction;
         case GGML_OP_RWKV_WKV6:
         case GGML_OP_RWKV_WKV7:
             return true;