drm/i915/crt: Drop pointless drm_device variables

Remove a bunch of pointless 'struct drm_device *dev' local variables.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241107161123.16269-9-ville.syrjala@linux.intel.com


Reviewed-by: Jani Nikula <jani.nikula@intel.com>