V4L/DVB (6733): DVB: Compile 3000MC-specific DIB code only for CONFIG_DVB_DIB3000MC

On Tue, 4 Dec 2007, Ingo Molnar wrote:

>  drivers/built-in.o: In function `dibusb_dib3000mc_tuner_attach':
>  : undefined reference to `dib3000mc_get_tuner_i2c_master'
>  drivers/built-in.o: In function `dibusb_dib3000mc_tuner_attach':
>  : undefined reference to `dib3000mc_set_config'

Seems like -common part contains also code that is not completely
common to all the modules.

Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Tested-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>