video: tegra: nvsr: sparse mode changes

video: tegra: nvsr: sparse mode changes

A few changes relating to Sparse mode and
prep for future functionality:

- Track self-refresh mode with TEGRA_DC_OUT_NVSR_MODE
  instead of reusing ONE_SHOT_MODE
- Add ability to keep DP link on or disable it during
  sparse mode
- Add modeset notifier
- Refactor sparse enable/disable, SRC init, vendor
  id and device
- Fix resync_delay type and resync capability check

Bug 1315461

Change-Id: I74014f193e66a8dad5145a37985b54728348dfe5
Signed-off-by: Daniel Solomon <daniels@nvidia.com>
Reviewed-on: http://git-master/r/497178
Reviewed-by: Mitch Luban <mluban@nvidia.com>
Tested-by: Mitch Luban <mluban@nvidia.com>