init.sh: Remove porter/silk/koelsch from supported
init.sh: Remove porter/silk/koelsch from supported

From GDP 13, R-Car generation 2 is no longer officially supported in
favor of generation 3.

For now it is kept in valid target list, despite some build issues.
There are some compatibility issues to fix with the morty branch - if we
get community contribution to fix up some issues then Gen 2 could in
theory be a working target again.

Signed-off-by: Gunnar Andersson <df6c1dc70ee3404c16d7de0a5a8d978b44fa18d4@genivi.org>

GENIVI/genivi-dev-platform,GENIVI/genivi-dev-platform,gunnarx/genivi-dev-platform,GENIVI/genivi-dev-platform,DunderRoffe/genivi-dev-platform,chbae/genivi-dev-platform,GENIVI/genivi-dev-platform,chbae/genivi-dev-platform,gunnarx/genivi-dev-platform,chbae/genivi-dev-platform,gunnarx/genivi-dev-platform,DunderRoffe/genivi-dev-platform,chbae/genivi-dev-platform,DunderRoffe/genivi-dev-platform,DunderRoffe/genivi-dev-platform,gunnarx/genivi-dev-platform,DunderRoffe/genivi-dev-platform