staging: vt6655: remove filename from mac.h

This patch resolves checkpatch's warning, "It's generally not useful to
have the filename in the file" for mac.c.

Signed-off-by: Lucas Henneman <lucas.henneman@linaro.org>
Link: https://lore.kernel.org/r/20210723144340.15787-14-lucas.henneman@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>