V4L/DVB (9197): zoran: set adapter class to I2C_CLASS_TV_ANALOG

The adapter class of the zoran driver was never set. However, converting
i2c drivers used by zoran to the new i2c API requires this field to be
correct.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>