Are you testing this in virt-manager or something? That error won’t harm your installation in any manner. You can remove bochs_drm from the MODULES line as root to resolve the issue. Another way could be to install bochs package from manjaro repos…though I am not sure about this method.
bochs-drm is bit aged and was the predecessor of qemu. Those entries in /etc/mkinitcpio.conf in MODULES are added post installation by some mhwd-live script.
@philm bochs-drm should be removed from there.