The idea that "newer" NSS firmware = "better" is not always true.
Especially given that 11.4 is the only firmware known to work with mesh,
among other issues like WDS/rmnet_nss being broken on 12.5 releases.
Add option to allow building for all known and available NSS firmwares.
The following are now supported NSS firmwares:
1.) 11.4.0.5-5
2.) 12.1
3.) 12.2
4.) 12.5
Users should start with 11.4 as that seems to be the one with the most
enabled features. It is now also the default version.
Signed-off-by: Sean Khan <datapronix@protonmail.com>
