update the fp8 header file name (#65)

* update the fp8 header name

[ROCm/rccl-tests commit: e447c17382]

projects/rccl-tests/src/common.cu

@@ -8,7 +8,7 @@
  ************************************************************************/
 
 #include "cuda_runtime.h"
-#include "rccl_bfloat8.h"
+#include "rccl_float8.h"
 #include "rccl_bfloat16.h"
 #include "common.h"
 #include <pthread.h>