Add helper function for -soundhw deprecation.  It can replace the
simple init functions which just call {isa,pci}_create_simple()
with a hardcoded type.  It also prints a deprecation message.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 20200702132525.6849-4-kraxel@redhat.com