ipaplatform/debian: Use multiarch path for libsofthsm2.so
    
    The library moved there some years ago, and the compat symlink might go
    away at some point. Better prepare for it.
    
    Signed-off-by: Timo Aaltonen <tjaalton@debian.org>
    Reviewed-By: Rob Crittenden <rcritten@redhat.com>