Revert "machine: Convert abstract typename on compat_props to subclass names"

Revert "machine: Convert abstract typename on compat_props to subclass names"

This reverts commit 0bcba41fe379e4c6834adcf1456d9099db31a5b2.

The bug addressed by that commit is now fixed in a better way by the
commit "qdev: fix the order compat and global properties are applied".

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20170711004303.3902-4-ehabkost@redhat.com>
Acked-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Halil Pasic <pasic@linux.vnet.ibm.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>