[media] V4L2: OMAP: VOUT: isr handling extended for DPI and HDMI interface

Extending the omap vout isr handling for:
- HDMI interface.

These are the new interfaces added to OMAP4 DSS.

Signed-off-by: Amber Jain <amber@ti.com>
Signed-off-by: Vaibhav Hiremath <hvaibhav@ti.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>