video: tegra: host: t210: Powergate host1x domain

video: tegra: host: t210: Powergate host1x domain

Host1x does not support powergating, however, we still use genpd
to virtually show when it is alive and when it is not. Mark host1x
domain as powergatable on T210.

Change-Id: Ie2d47ef69f7818fa92b80728ab03ebb5e30e50fa
Signed-off-by: Arto Merilainen <amerilainen@nvidia.com>
Reviewed-on: http://git-master/r/554925
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Shridhar Rasal <srasal@nvidia.com>
Reviewed-by: Deepak Nibade <dnibade@nvidia.com>
GVS: Gerrit_Virtual_Submit