Enable AVX for inlined mju_dotSparse.

PiperOrigin-RevId: 711858423
Change-Id: Id2d06a9e87085e9f810779fba4e8ed9c19a4cba9

Author: yuvaltassa

src/engine/engine_util_sparse.h

@@ -18,6 +18,7 @@
 #include <mujoco/mjdata.h>
 #include <mujoco/mjexport.h>
 #include <mujoco/mjtnum.h>
+#include "engine/engine_util_sparse_avx.h"  // IWYU pragma: keep
 
 #ifdef __cplusplus
 extern "C" {