Revert "hw/core/qdev-properties: Use qemu_strtoul() in set_pci_host_devaddr()"

This reverts commit bccb20c4 as it
introduced a regression blocking bus addresses > 0x1f or higher.
Legal bus numbers go up to 0xff.

Fixes: bccb20c4 ("Use qemu_strtoul() in set_pci_host_devaddr()")
Reported-by: Klaus Herman <kherman@inbox.lv>
Reported-by: Geoffrey McRae <geoff@hostfission.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Cc: "Philippe Mathieu-Daudé" <philmd@redhat.com>
Message-Id: <20201120130409.956956-1-mst@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>