Two methods are available:
One is to resize your input images to 229x229, then directly using ResNet or VGG etc.
Two is that You can revise the net-structure of  ResNet, VGG etc.,making ResNet, VGG-variants accept 128x128 RGB images, then load part weights of the pretrained model ResNet or VGG，finally use your own dataset to train/finetune the revised Network.