Revert "tegra: dc: Fix div by zero in frame time computation."

This reverts commit b01bc4887905bf87acc29a3eb519f424f1f7de34.

Needed to revert 2743674722376e0c1d85de4d2eddbf4fe8228500.
Revert "video: tegra: dc: Add timestamp support"

This reverts commit 2743674722376e0c1d85de4d2eddbf4fe8228500.

Causes 2D acceleration issues.