drm: Prevent sign extension on hdisplay and vdisplay

drm: Prevent sign extension on hdisplay and vdisplay

Some functions in drm multiply hdisplay and vdisplay with a third
factor, which can result in a sign extension according to static
analysis due to an implicit s32 promotion.  Use a cast to u32 to
prevent this.

Suggested-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Krzystof Karas <krzysztof.karas@intel.com>
Signed-off-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Andi Shyti <andi.shyti@intel.com>
Link: https://lore.kernel.org/r/20251007153645.90920-2-jonathan.cavitt@intel.com
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>