video: tegra: host: Rework nvhost sync API

video: tegra: host: Rework nvhost sync API

vhost sync API used both nvhost_sync_pt and sync_pt structures when
requesting information about a syncpoint. This is unnecessary as
in practise we always have only the sync_pt structure when calling
the sync API. This patch modifies the sync API so that we use
sync_pt structure by default.

Change-Id: I1e3f23b06d4ebd8894acca7c29d0ba38d475a92b
Signed-off-by: Arto Merilainen <amerilainen@nvidia.com>
Reviewed-on: http://git-master/r/383110
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>