drm/rockchip/rockchip_lvds: Fix struct document formatting

Must start with "struct <name>"

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/rockchip/rockchip_lvds.c:49: warning: cannot understand function prototype: 'struct rockchip_lvds_soc_data '

Cc: Sandy Huang <hjc@rock-chips.com>
Cc: "Heiko Stübner" <heiko@sntech.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Mark Yao <mark.yao@rock-chips.com>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-rockchip@lists.infradead.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20201116174112.1833368-27-lee.jones@linaro.org

drivers/gpu/drm/rockchip/rockchip_lvds.c

@@ -42,7 +42,7 @@ struct rockchip_lvds;
 		container_of(c, struct rockchip_lvds, encoder)
 
 /**
- * rockchip_lvds_soc_data - rockchip lvds Soc private data
+ * struct rockchip_lvds_soc_data - rockchip lvds Soc private data
  * @probe: LVDS platform probe function
  * @helper_funcs: LVDS connector helper functions
  */