staging: vt6655: Convert macro MACvReceive0 to function

staging: vt6655: Convert macro MACvReceive0 to function

Convert macro to static function. Multiline macros are not liked by
kernel community. Rename variable dwData to reg_value to avoid
CamelCase which is not accepted by checkpatch.pl. Change variable
declaration to u32 as this improves readability.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/059aca149bd0c1d75df4fb3cd8a177aa4948fb02.1659080988.git.philipp.g.hortmann@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>