V4L/DVB (5771): Get_dvb_firmware: update script for new location

Get_dvb_firmware: update script for new location of sp8870 firmware

This url is no longer valid:
http://www.technotrend.de/new/217g/tt_Premium_217g.zip

Replace with: 
http://www.softwarepatch.pl/9999ccd06a4813cb827dbb0005071c71/tt_Premium_217g.zip



Thanks-to: Tobias Stoeber <tobi@to-st.de>

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>