decklinkvideosink: Fix support for raw CEA608 input and add support for raw CEA708 input

The former was only considering the first byte pair, for the latter we
have to convert raw CEA708 cc_data into CDP.
6 jobs for ccconverter in 27 minutes and 46 seconds (queued for 1 second)
Status Job ID Name Coverage
  Preparation
passed #67227
gst indent

00:00:16

passed #67226
manifest

00:00:34

 
  Build
passed #67228
build fedora x86_64

00:02:56

 
  Test
passed #67229
check fedora

00:17:11

 
  Full Builds
passed #67230
build android arm64 api28

00:03:35

passed #67231
build cerbero fedora x86_64

00:07:03