Reinstall would simply be putting the default kernel (and perhaps modules) back in. The driver is integrated with the kernel in the default config, and so the only way to change it would be to change the Image kernel file itself. You could just flash and this would be put back in, but if you want to compile the kernel and manually put this back you could.
If you have the original “/boot/Image” file, then it is just a simple copy. If you still have the content from having flashed, then on the host it would be at “Linux_for_Tegra/kernel/Image”, or at “Linux_for_Tegra/rootfs/boot/Image”.