drm/amd/display: Fix HDMI framepack 3D test issue

drm/amd/display: Fix HDMI framepack 3D test issue

[why]
Bandwidth validation failure on framepack tests.
Need to double pixel clock when 3D format is
framepack. Also for HDMI displays, we need to
keep the ITC flag to 1 by default.

[how]
Double the pixel clock when using framepack 3D format.
Set hdmi ITC bit to 1.

Reviewed-by: Charlene Liu <charlene.liu@amd.com>
Acked-by: Roman Li <roman.li@amd.com>
Signed-off-by: Sung Joon Kim <sungkim@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>