OMAP4: DSS: Fix to correct the manager index for VSYNC irq handler

Patch to fix the Manager id in dss_completion_irq_handler.
DSSCOMP is expecting the manager id 1 to be mapped to HDMI display.
This patch fixes the DSSCOMP_STATE_DISPLAYED callback in DSSCOMP.

Change-Id: I0aab3e494cb305d75a64fabc4cd6919def636285
Signed-off-by: Muralidhar Dixit <murali.dixit@ti.com>
Signed-off-by: Varadarajan Charulatha <charu@ti.com>