DVB: add firesat driver

Original code written by Christian Dolzer <c.dolzer@digital-everywhere.com>

Cleaned up by Greg.

Major cleanup and reorg by Manu Abraham <manu@linuxtv.org>

Additions also by Ben Backx <ben@bbackx.com>

Cc: Christian Dolzer <c.dolzer@digital-everywhere.com>
Cc: Andreas Monitzer <andy@monitzer.com>
Cc: Manu Abraham <manu@linuxtv.org>
Cc: Fabio De Lorenzo <delorenzo.fabio@gmail.com>
Cc: Robert Berger <robert.berger@reliableembeddedsystems.com>
Signed-off-by: Ben Backx <ben@bbackx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

Added missing dependency to dvb/firesat/Kconfig,
Reported-by: Randy Dunlap <randy.dunlap@oracle.com>

Tweaked dvb/Makefile.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>