Reenable v8.1/v8.2 aarch64 extensions
    
    These were enabled already in SLE15 and we want to default to the
    upstream defaults, which enable these features.
    
    Config changes:
          - aarch64:
          HW_AFDBM=y
          PAN=y
          LSE_ATOMICS=y
          VHE=y
          UAO=y
          SVE=y