genlib: add missing slash to korg_path for stable

Without this slash it wants to use the directory /backportsstable/

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
backports: Add a defconfig for ath9k debugging

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>