drm/xlnx: Don't set struct drm_device.irq_enabled

The field drm_device.irq_enabled is only used by legacy drivers
with userspace modesetting. Don't set it in xlnx.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210625082222.3845-27-tzimmermann@suse.de

drivers/gpu/drm/xlnx/zynqmp_dpsub.c

@@ -111,8 +111,6 @@ static int zynqmp_dpsub_drm_init(struct zynqmp_dpsub *dpsub)
 	if (ret)
 		return ret;
 
-	drm->irq_enabled = 1;
-
 	drm_kms_helper_poll_init(drm);
 
 	/*