dkms-mt7601: to use v3.0.0.4 upsteam src.

Fixes build failure on kernel 3.14 caused by kernel data structure change into
an actual C struct.

It also uses the new v3.0.0.4 upstream sources. The source.tar.bz2 has
been rehosted on github.io.
If it's not needed anymore, just delete it.  Git has amazing powers to view past versions if needed.