Older Tegra's do not support RGBA format for the cursor, but instead
overlay plane could be used for it. Since there is no much use for the
overlays on a regular desktop and HW-accelerated cursor is much better
than a SW cursor, let's dedicate one overlay plane to the mouse cursor.
Signed-off-by: NDmitry Osipenko <digetx@gmail.com>
Signed-off-by: NThierry Reding <treding@nvidia.com>