Revert "debian: Update driver name on DKMS files"

This reverts commit 7608a94c95bafe47037de6ceb1a762b13ec83fad.
Revert "debian: Add dependency on linux-source"

The linux-source package is still used if present, but not strictly needed
anymore.

This reverts commit 4c64c8eba5e84f534bc2255853340201ff7296f8.

Conflicts:
	debian/control
Version bump: 2.4.8-3
Blacklist mainline module *before* installing ours
Version bump: 2.4.8-4