video: tegra: host: use dynamic syncpt for hwctx

video: tegra: host: use dynamic syncpt for hwctx

- do not request syncpts in hwctx handler init which is common path
  for all clients
- this results in unnecessary booking of syncpts at init time and for
  all clients

- request the syncpt from *_alloc_hwctx() call which is specific
  to each client
- this way we can request syncpt for client who really needs it for its
  hwctx

Bug 1305024

Change-Id: Ib5276da0d9d013487149262223bf5f9cf4e79bbf
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/363888
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Shridhar Rasal <srasal@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>