debian: split udev rule into its own package

This resolves a problem where libbladerf0 and libbladerf1 cannot installed on the same system, as part of an upgrade for example.

This, unfortunately, makes libbladerf0 and libbladerf1 mutually exclusive.  Hindsight, etc.

If anyone pulled the "bad" PPA from snapshots before I deleted it, they'll need to apt-get remove libbladerf1 and bladerf to get back to a clean state.

tl;dr: I should have tested before pull-requesting :-)