get_dvb_firmware: fix download site for tda10046 firmware

commit 25ec43d3e6306978cf66060ed18c4160ce8fc302 upstream.

The previous website doesn't exist anymore. Update it to one site that
actually exists.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>