module: move tainting until after a module hits our linked list

It is silly to have taints spread out all over, we can just compromise
and add them if the module ever hit our linked list. Our sanity checkers
should just prevent crappy drivers / bogus ELF modules / etc and kconfig
options should be enough to let you *not* load things you don't want.

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>