staging: vt6656: Remove ftrace-like logging

This patch fixes the checkpatch.pl warning like:
WARNING: Unnecessary ftrace-like logging - prefer using ftrace

Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/084064a5c94aad940600ae62d6c21bb26629cb2c.1645477326.git.philipp.g.hortmann@gmail.com


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