staging: vt6656: Remove functions' documentation

Remove the functions' documentation as the names of the functions are
clear enought. Also, the actual documentation it's not correct in all
cases.

Signed-off-by: Oscar Carter <oscar.carter@gmx.com>
Link: https://lore.kernel.org/r/20200425134257.4502-3-oscar.carter@gmx.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>