drm/vmwgfx/vmwgfx_validation: Add some missing struct member/function param descriptions

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

 drivers/gpu/drm/vmwgfx/vmwgfx_validation.c:85: warning: Function parameter or member 'dirty' not described in 'vmw_validation_res_node'
 drivers/gpu/drm/vmwgfx/vmwgfx_validation.c:85: warning: Function parameter or member 'dirty_set' not described in 'vmw_validation_res_node'
 drivers/gpu/drm/vmwgfx/vmwgfx_validation.c:216: warning: Function parameter or member 'res' not described in 'vmw_validation_find_res_dup'
 drivers/gpu/drm/vmwgfx/vmwgfx_validation.c:216: warning: Excess function parameter 'vbo' description in 'vmw_validation_find_res_dup'

Cc: VMware Graphics <linux-graphics-maintainer@vmware.com>
Cc: Roland Scheidegger <sroland@vmware.com>
Cc: Zack Rusin <zackr@vmware.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Zack Rusin <zackr@vmware.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210115181601.3432599-9-lee.jones@linaro.org

drivers/gpu/drm/vmwgfx/vmwgfx_validation.c

@@ -48,7 +48,6 @@ struct vmw_validation_bo_node {
 	u32 as_mob : 1;
 	u32 cpu_blit : 1;
 };
-
 /**
  * struct vmw_validation_res_node - Resource validation metadata.
  * @head: List head for the resource validation list.
@@ -64,6 +63,8 @@ struct vmw_validation_bo_node {
  * @first_usage: True iff the resource has been seen only once in the current
  * validation batch.
  * @reserved: Whether the resource is currently reserved by this process.
+ * @dirty_set: Change dirty status of the resource.
+ * @dirty: Dirty information VMW_RES_DIRTY_XX.
  * @private: Optionally additional memory for caller-private data.
  *
  * Bit fields are used since these structures are allocated and freed in
@@ -205,7 +206,7 @@ vmw_validation_find_bo_dup(struct vmw_validation_context *ctx,
  * vmw_validation_find_res_dup - Find a duplicate resource entry in the
  * validation context's lists.
  * @ctx: The validation context to search.
- * @vbo: The buffer object to search for.
+ * @res: Reference counted resource pointer.
  *
  * Return: Pointer to the struct vmw_validation_bo_node referencing the
  * duplicate, or NULL if none found.