There are already iCVS feed where the module-init-tools is:
Check your feed config file: /etc/opkg/mipsel-feed.conf
I have download.blue-panel.com/icvs/dm800/opendreambox/1.6/feed/06092011/mipsel inside it.
I know that newest kernel has slightly different modules and thus you cannot use older modules from usbtuner_0.4.3b_800.ipk anymore :(.
PS: If you really need support for tda18218 you can use OpenPLI or SIFTeam image which are not the CVS images. The situation is bad, not every patch is accepted by DMM image (and/or CVS) developers.
I have extracted modules from usbtuner_0.4.3b_800.
Here you are, you can try: