meta-arm walnascar update

meta-arm has released an updated walnascar support tag, 5.2.1.  The tag 
contains 8 patches from between 16 Jun 2025 and 04 Nov 2025.

Per an external request, we have duplicated all existing "numbers only" 
tags (i.e., 5.2.1) with a yocto-x.y.z tag (i.e., yocto-5.2.1).

Thanks,
Jon