V4L/DVB (3292): Fixed xc3028 firmware extractor, added terratec fw support

Fixed xc3028 firmware extractor for terratec's emBDA.sys firmware
Fixed delay in firmwareupload, now terratec's firmware also works

Signed-off-by: Markus Rechberger <mrechberger@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>