drm/nouveau/disp: Use dev->dev to get the device

The local variable dev points to drm->dev already, use dev directly.

Link: https://lore.kernel.org/r/20250409103344.3661603-1-sakari.ailus@linux.intel.com


Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Danilo Krummrich <dakr@kernel.org>