All dnn_benchmarks read model_params from build dir

hpvm/test/dnn_benchmarks/CMakeLists.txt

hpvm/test/dnn_benchmarks/benchmarks/alexnet/alexnet.cpp

hpvm/test/dnn_benchmarks/benchmarks/alexnet/alexnet_loop.cpp

hpvm/test/dnn_benchmarks/benchmarks/alexnet2/alexnet2.cpp

...test/dnn_benchmarks/benchmarks/alexnet2/alexnet2_loop.cpp

...est/dnn_benchmarks/benchmarks/lenet_mnist/lenet_mnist.cpp

...nn_benchmarks/benchmarks/lenet_mnist/lenet_mnist_loop.cpp

hpvm/test/dnn_benchmarks/benchmarks/mobilenet/mobilenet.cpp

...st/dnn_benchmarks/benchmarks/mobilenet/mobilenet_loop.cpp

hpvm/test/dnn_benchmarks/benchmarks/resnet18/resnet18.cpp

...test/dnn_benchmarks/benchmarks/resnet18/resnet18_loop.cpp

...dnn_benchmarks/benchmarks/vgg16_cifar10/vgg16_cifar10.cpp

...enchmarks/benchmarks/vgg16_cifar10/vgg16_cifar10_loop.cpp

...n_benchmarks/benchmarks/vgg16_cifar100/vgg16_cifar100.cpp

...chmarks/benchmarks/vgg16_cifar100/vgg16_cifar100_loop.cpp

hpvm/test/dnn_benchmarks/include/config.h.in