Removed cudnn targets in non-cudnn benchmarks

...s/hpvm-c/benchmarks/alexnet2_cifar10/alexnet2_cifar10.cpp

...rks/hpvm-c/benchmarks/alexnet_cifar10/alexnet_cifar10.cpp

...s/hpvm-c/benchmarks/alexnet_imagenet/alexnet_imagenet.cpp

..._benchmarks/hpvm-c/benchmarks/lenet_mnist/lenet_mnist.cpp

...hpvm-c/benchmarks/mobilenet_cifar10/mobilenet_cifar10.cpp

...s/hpvm-c/benchmarks/resnet18_cifar10/resnet18_cifar10.cpp

...chmarks/hpvm-c/benchmarks/vgg16_cifar10/vgg16_cifar10.cpp

...marks/hpvm-c/benchmarks/vgg16_cifar100/vgg16_cifar100.cpp

...marks/hpvm-c/benchmarks/vgg16_imagenet/vgg16_imagenet.cpp