tests: tegra: Add syncpt-wait test

This is a very simple sanity test to check whether or not a syncpt can
be incremented by a host1x client. This uses gr2d on Tegra20 through
Tegra114 and VIC on Tegra124 and later.

Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>