I believe I've built all v4l packages patched for the current kernel.
But I could have made a mistake somewhere :P
Could you please verify that your module has been installed with:
opkg --list-installed | grep v4l
If you see your module listed then check whether you can find it with: find /lib/modules/`uname -r`/
There should be a .ko file that matches your device driver.
Now load it with modprobe, and if it says something like unresolved symbols type: dmesg
It will print the kernel log which will tell you which symbols are missing.
Paste them here and I'll make sure to include them in the next build.

Also I believe bitbake doesn't take care of the dependencies for pre-compiled kernel modules, so it could be possible that your symbols are presented in some other v4l package.

But we'll know once you show us the missing symbols