staging: vt6655: Rename wBits to bit_mask 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/8929407dc7355df515b7f9fdd195b45ff44f6b98.1657657918.git.philipp.g.hortmann@gmail.com


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