Fix mismatched use of xnn_allocate_zero_simd_memory and xnn_release_m…

…emory

This causes crashes on windows, uncovered in #7830.

This bug appears with `xnn_create_runtime_v4`, other paths that allocate workspaces have matching allocate/free calls.

PiperOrigin-RevId: 728501674

src/runtime.c

@@ -532,7 +532,7 @@ enum xnn_status xnn_create_runtime_v4(
 
   if (workspace == NULL) {
     xnn_log_debug("Allocating non-shared workspace");
-    workspace = xnn_allocate_zero_simd_memory(sizeof(struct xnn_workspace));
+    workspace = xnn_allocate_zero_memory(sizeof(struct xnn_workspace));
   }
 
   const uint32_t optimization_flags = XNN_FLAG_HINT_SPARSE_INFERENCE | XNN_FLAG_HINT_FP16_INFERENCE |