Add F4E2M1FN type: import mxfloat.h

Author: sergey-kozub

third_party/tsl/tsl/platform/BUILD

@@ -1066,6 +1066,7 @@ cc_library(
     deps = [
         "@ml_dtypes//:float8",
         "@ml_dtypes//:intn",
+        "@ml_dtypes//:mxfloat",
     ],
 )
 

third_party/tsl/tsl/platform/ml_dtypes.h

@@ -16,10 +16,12 @@ limitations under the License.
 #ifndef TENSORFLOW_TSL_PLATFORM_ML_DTYPES_H_
 #define TENSORFLOW_TSL_PLATFORM_ML_DTYPES_H_
 
-#include "ml_dtypes/include/float8.h"  // from @ml_dtypes
-#include "ml_dtypes/include/intn.h"  // from @ml_dtypes
+#include "ml_dtypes/include/float8.h"   // from @ml_dtypes
+#include "ml_dtypes/include/intn.h"     // from @ml_dtypes
+#include "ml_dtypes/include/mxfloat.h"  // from @ml_dtypes
 
 namespace tsl {
+using float4_e2m1fn = ::ml_dtypes::float4_e2m1fn;
 using float8_e3m4 = ::ml_dtypes::float8_e3m4;
 using float8_e4m3 = ::ml_dtypes::float8_e4m3;
 using float8_e4m3fn = ::ml_dtypes::float8_e4m3fn;