staging: vt6655: Rename byData to reg_value in two macros

Fix name of a variable in two macros that use CamelCase which is not
accepted by checkpatch.pl

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/159014866cce40913d360a0692fb3c426d4cb840.1657657918.git.philipp.g.hortmann@gmail.com


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