drm/vmwgfx/vmwgfx_bo: Remove superfluous param description and supply another

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

 drivers/gpu/drm/vmwgfx/vmwgfx_bo.c:142: warning: Excess function parameter 'pin' description in 'vmw_bo_pin_in_vram_or_gmr'
 drivers/gpu/drm/vmwgfx/vmwgfx_bo.c:647: warning: Function parameter or member 'p_base' not described in 'vmw_user_bo_alloc'

Cc: VMware Graphics <linux-graphics-maintainer@vmware.com>
Cc: Roland Scheidegger <sroland@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/20210115181313.3431493-28-lee.jones@linaro.org

drivers/gpu/drm/vmwgfx/vmwgfx_bo.c

@@ -131,7 +131,6 @@ err:
  *
  * @dev_priv:  Driver private.
  * @buf:  DMA buffer to move.
- * @pin:  Pin buffer if true.
  * @interruptible:  Use interruptible wait.
  * Return: Zero on success, Negative error code on failure. In particular
  * -ERESTARTSYS if interrupted by a signal
@@ -635,6 +634,7 @@ static void vmw_user_bo_ref_obj_release(struct ttm_base_object *base,
  * @handle: Pointer to where the handle value should be assigned.
  * @p_vbo: Pointer to where the refcounted struct vmw_buffer_object pointer
  * should be assigned.
+ * @p_base: The TTM base object pointer about to be allocated.
  * Return: Zero on success, negative error code on error.
  */
 int vmw_user_bo_alloc(struct vmw_private *dev_priv,