Since the kernel module is part of our regular kernel tree it should be simply a matter of using an appropriate kernel config. As far as I can tell Boot2Qt uses our regular meta-toradex-nxp layer and its defconfig, so the kernel modules get built by default. In the 5.9.3 Boot2Qt image the kernel module is deployed in the folder /lib/modules/4.1.44-2.7.4+gb1555bf/kernel/drivers/rpmsg.