V4L/DVB: TVP7002 driver for DM365

This patch provides the implementation of the TVP7002 decoder
driver for DM365. Implemented using the V4L2 DV presets API.
Removed shadow register values. Testing shows that the device
needs not to be powered down and up for correct behaviour.
Improved readability. Uses helper function for preset information.

[mchehab@redhat.com: Fix bad Whitespacing]
Signed-off-by: Santiago Nunez-Corrales <santiago.nunez@ridgerun.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>