SW: drop firmware-linux-free + firmware-linux-nonfree from GRML_FULL

SW: drop firmware-linux-free + firmware-linux-nonfree from GRML_FULL

Addressing:

| dpkg: error processing /var/cache/apt/archives/firmware-linux-free_3_all.deb (--unpack):
|  trying to overwrite '/lib/firmware/keyspan_pda/keyspan_pda.fw', which is also in package linux-image-3.3.0-3-grml-amd64 3.3.7-1+grml.1
| dpkg: error processing /var/cache/apt/archives/firmware-linux-nonfree_0.35_all.deb (--unpack):
|  trying to overwrite '/lib/firmware/e100/d101m_ucode.bin', which is also in package linux-image-3.3.0-3-grml-amd64 3.3.7-1+grml.1

If there are any firmware files from firmware-linux-free
or firmware-linux-nonfree that we need to ship (like the
ones for radeon) we need to find a different way...