staging: vt6655: Rename MACvClearStckDS

Rename MACvClearStckDS macro to vt6655_mac_clear_stck_ds to avoid
CamelCase which is not accepted by checkpatch.pl and to clean up
namespace.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/8ba4413d52e95406393755f48da065511b891f03.1658986804.git.philipp.g.hortmann@gmail.com


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