media: platform: nvavp: use dynamic syncpt

media: platform: nvavp: use dynamic syncpt

- use API nvhost_get_syncpt_client_managed() to get syncpts dynamically
- move syncpt request to probe() so that syncpt is requested just once
  at init time only

Bug 1305024

Change-Id: I57e9388b2d2a3c491795bd5533d0b308f9e16798
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/360965
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Shridhar Rasal <srasal@nvidia.com>
Reviewed-by: Somu Sundaram <somasundarams@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>