DVB: get_dvb_firmware: update script for new location of tda10046 firmware

cherry picked from commit c545d6ad

Update get_dvb_firmware script for the new location of the
tda10046 firmware.

The old location doesn't work anymore.

Signed-off-by: Andreas Arens <ari@goron.de>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Signed-off-by: Adrian Bunk <bunk@kernel.org>