feeds: NSS: point to 6.x branch

This will now be the default NSS branch, and will cover
both kernel 6.1 and 6.6 related changes going forward.

qualcommax: NSS: fix up 'nss_region'

feeds.conf.default

@@ -2,7 +2,7 @@ src-git packages https://git.openwrt.org/feed/packages.git
 src-git luci https://git.openwrt.org/project/luci.git
 src-git routing https://git.openwrt.org/feed/routing.git
 src-git telephony https://git.openwrt.org/feed/telephony.git
-src-git nss_packages https://github.com/qosmio/nss-packages.git;NSS-12.4-K6.1
+src-git nss_packages https://github.com/qosmio/nss-packages.git;NSS-12.4-K6.x
 src-git sqm_scripts_nss https://github.com/qosmio/sqm-scripts-nss.git
 #src-git video https://github.com/openwrt/video.git
 #src-git targets https://github.com/openwrt/targets.git