staging: vt6656: Fix styling of the comment related to SPDX-License-Identifier

Fix checkpatch.pl styling error related to SPDX-License-Identifier
comment in vt6656/*.h

Signed-off-by: Ojaswin Mujoo <ojaswin25111998@gmail.com>
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>