Staging: ipack: change naming convention in TODO file

Use the ANSI/VITA 4.0-1995 (S2011) naming convention for the mezzanine or
daughter boards. They are called IP modules in the Standard.

Signed-off-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>