V4L/DVB (3929): Compilation for DVB_AV7110_FIRMWARE seems to be weird

Some systems use a previous config information to generate
a default config. This seems to cause troubles on some 
systems.

This patch also fixes compilation for AV7110 firmware
inside V4L/DVB tree.

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>