Support CUDA f16 without transformation. (#9207)

- Support f16 from cupy.
- Include CUDA header explicitly.
- Cleanup cmake nvtx support.

cmake/modules/FindNVTX.cmake

@@ -1,26 +0,0 @@
-if (NVTX_LIBRARY)
-  unset(NVTX_LIBRARY CACHE)
-endif (NVTX_LIBRARY)
-
-set(NVTX_LIB_NAME nvToolsExt)
-
-
-find_path(NVTX_INCLUDE_DIR
-  NAMES nvToolsExt.h
-  PATHS ${CUDA_HOME}/include ${CUDA_INCLUDE} /usr/local/cuda/include)
-
-
-find_library(NVTX_LIBRARY
-  NAMES nvToolsExt
-  PATHS ${CUDA_HOME}/lib64 /usr/local/cuda/lib64)
-
-message(STATUS "Using nvtx library: ${NVTX_LIBRARY}")
-
-include(FindPackageHandleStandardArgs)
-find_package_handle_standard_args(NVTX DEFAULT_MSG
-                                  NVTX_INCLUDE_DIR NVTX_LIBRARY)
-
-mark_as_advanced(
-  NVTX_INCLUDE_DIR
-  NVTX_LIBRARY
-)