Enable data tiling for ukernel

Add the --iree-flow-enable-data-tiling flag for ukernel so that mmt4d  will be used.

Change-Id: I3275cbcb89bb41c98ce764db55ee02de433c7b73

cmake/springbok_vmvx_module.cmake

diff --git a/cmake/springbok_vmvx_module.cmake b/cmake/springbok_vmvx_module.cmake
index a720a40..1af725a 100644
--- a/cmake/springbok_vmvx_module.cmake
+++ b/cmake/springbok_vmvx_module.cmake
@@ -76,6 +76,7 @@
   else()
     list(APPEND _COMPILER_ARGS "--iree-hal-target-backends=vmvx")
     list(APPEND _COMPILER_ARGS "--iree-vmvx-enable-microkernels")
+    list(APPEND _COMPILER_ARGS "--iree-flow-enable-data-tiling")
   endif()
 
   if(_RULE_EMITC)