drm/tegra: dsi - Fix typo when disabling controller
drm/tegra: dsi - Fix typo when disabling controller

When disabling the DSI controller, the code wasn't really doing what it
was supposed to.

Signed-off-by: Thierry Reding <3055038c414aef68bf32c33b8118623e7554e0f2@nvidia.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs