[media] media: ti-vpe: scaler: Add debug support for multi-instance

Since there might be more then one instance it is better to
show the base address when dumping registers to help
with debugging.

Signed-off-by: Benoit Parrot <bparrot@ti.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>