[media] staging: as102: Unconditionally compile code dependent on DVB_CORE

The driver depends on DVB_CORE so there is no need for conditional
compilation of parts of the code depending on CONFIG_DVB_CORE as
the driver is never compiled with CONFIG_DVB_CORE* disabled.

Cc: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Sylwester Nawrocki <snjw23@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>