[media] smiapp: Obtain device information from the Device Tree if OF node exists

Platform data support is retained.

of_property_read_u64_array() isn't used yet as it's not in yet.

Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>