media: dvb: add missing DVB-S2X FEC parameter values

This commit is adding the missing short FEC
Missed on commit 6508a50f

More info: https://dvb.org/wp-content/uploads/2021/02/A083-2r2_DVB-S2X_Draft-EN-302-307-2-v131_Feb_2021.pdf
Table 1: S2X System configurations and application areas

Please note that 128APSK, 256APSK and 256APSK-L
and FEC 29/45, 31/45 are still missing from enums.

Link: https://lore.kernel.org/linux-media/20230111194608.1853-1-athoik@gmail.com


Cc: Robert Schlabbach <robert_s@gmx.net>
Cc: Tom Richardson <trichardson@availink.com>
Signed-off-by: Athanasios Oikonomou <athoik@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>