drm/rockchip: remove unused psr_list{,_lock}

Some leftover cleanup from commit 6c836d96 ("drm/rockchip: Use the
helpers for PSR").

Cc: Heiko Stuebner <heiko@sntech.de>
Cc: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20210915135007.1.I926ef5cef287047c35a17e363c919599c6ee6e4c@changeid

drivers/gpu/drm/rockchip/rockchip_drm_drv.c

@@ -138,9 +138,6 @@ static int rockchip_drm_bind(struct device *dev)
 
 	drm_dev->dev_private = private;
 
-	INIT_LIST_HEAD(&private->psr_list);
-	mutex_init(&private->psr_list_lock);
-
 	ret = rockchip_drm_init_iommu(drm_dev);
 	if (ret)
 		goto err_free;

drivers/gpu/drm/rockchip/rockchip_drm_drv.h

@@ -48,8 +48,6 @@ struct rockchip_drm_private {
 	struct iommu_domain *domain;
 	struct mutex mm_lock;
 	struct drm_mm mm;
-	struct list_head psr_list;
-	struct mutex psr_list_lock;
 };
 
 int rockchip_drm_dma_attach_device(struct drm_device *drm_dev,