package/dvb-apps: rely on dtv-scan-tables to provide transponder data

This is a transitioning solution before switching packages that need the
transponders data, to use dtv-scan-tables instead of dvb-apps.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>