Staging: vt6656: Use C89 comments in power.c

Reformat the comments in power.c to use the C89 commenting
style instead of the C99 commenting style.

Signed-off-by: Philip Worrall <philip.worrall@googlemail.com>
Reviewed-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>