Staging: add b3dfg driver

Initial b3dfg driver development as preformed by Daniel Drake.  All
basic functionality is completed.
Signed-off-by: Justin Bronder <jsbronder@brontes3d.com>
Cc: Daniel Drake <ddrake@brontes3d.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>