Change CUB submodule to track Nvidia CUB project.

Directly change submodule URL will impact every developer.
"git submodule update" won't work, developer has to use
"git submodule sync" first.

To avoid impact every developer, remove CUB and add a new
"nvidia_cub" to workaround this issue.

.gitmodules

@@ -20,12 +20,12 @@
 	path = 3rdparty/mkldnn
 	url = https://github.com/intel/mkl-dnn.git
 	branch = master
-[submodule "3rdparty/cub"]
-	path = 3rdparty/cub
-	url = https://github.com/dmlc/cub
 [submodule "3rdparty/tvm"]
 	path = 3rdparty/tvm
 	url = https://github.com/dmlc/tvm
 [submodule "3rdparty/onnx-tensorrt"]
 	path = 3rdparty/onnx-tensorrt
 	url = https://github.com/onnx/onnx-tensorrt.git
+[submodule "3rdparty/nvidia_cub"]
+	path = 3rdparty/nvidia_cub
+	url = https://github.com/NVlabs/cub.git

Makefile

@@ -417,7 +417,7 @@ LIB_DEP += $(DMLC_CORE)/libdmlc.a $(NNVM_PATH)/lib/libnnvm.a
 ALL_DEP = $(OBJ) $(EXTRA_OBJ) $(PLUGIN_OBJ) $(LIB_DEP)
 
 ifeq ($(USE_CUDA), 1)
-	CFLAGS += -I$(ROOTDIR)/3rdparty/cub
+	CFLAGS += -I$(ROOTDIR)/3rdparty/nvidia_cub
 	ALL_DEP += $(CUOBJ) $(EXTRA_CUOBJ) $(PLUGIN_CUOBJ)
 	LDFLAGS += -lcufft
 	ifeq ($(ENABLE_CUDA_RTC), 1)