Staging: vt6655: comment headings formatting

This patch makes the formatting of the comments in mac.h more
consistent.

* Where a heading takes up three comment lines it is reduced to one.
* A newline always separates column headings

Signed-off-by: Emrys Bayliss <emrys@paradise.net.nz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>