lantiq: ltq-vmmc add support for ar9-vr9

(required not-distributable firmware blob - dump it by yourself from original firmware)

Signed-off-by: Eddi De Pieri <eddi@depieri.net>

(cherry picked from commit ea9e61b8eb61a2e362a50541f03466dc7d087947)
Signed-off-by: Stefan Koch <stefan.koch10@gmail.com>