video: tegra: dc: select right windows for update

video: tegra: dc: select right windows for update

Use win->idx instead of windows table index to select right window
for tegra_dc_update_windows and tegra_dc_windows_are_clean funcs.

bug 1467186

Change-Id: I2e0f660556ad175205f173ca28195ac788eca08b
Signed-off-by: Jong Kim <jongk@nvidia.com>
Signed-off-by: Pankaj Dabade <pdabade@nvidia.com>
Reviewed-on: http://git-master/r/377514
GVS: Gerrit_Virtual_Submit
Reviewed-by: Eric Brower <ebrower@nvidia.com>
Reviewed-by: Matthew Pedro <mapedro@nvidia.com>
Tested-by: Matthew Pedro <mapedro@nvidia.com>