drm/rockchip: for error print, use the correct device pointer

There is a use of DRM_DEV_ERROR(dsi->dev,..)
which should be replaced with DRM_DEV_ERROR(dev, ..)
since dsi->dev is set later

Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20201116141609.26719-2-dafna.hirschfeld@collabora.com