[media] rc/keymaps: add keytable for Terratec Cinergy S2 HD

This RC map was taken from Christoph Pinkl's patch
(http://patchwork.linuxtv.org/patch/7217/). It is used solely by the respective
mantis based card because the encoding is not known.

Signed-off-by: Jan Klötzke <jan@kloetzke.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>