Move vpif related definitions for capture and display drivers
from dm646x platform header file to vpif_types.h inside
the driver as these definitions are related to driver code
rather than the platform or board.

This enables reusing this IP across platforms.
Signed-off-by: Manjunath Hadli <manjunath.hadli@ti.com>
Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>