This converts two devices at once because PIC subclasses ISA and converting
subclasses independently is extremely hard.
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

Prepare Intel 82374 emulation for use by Intel 82378 PCI->ISA bridge.
Signed-off-by: NHervé Poussineau <hpoussin@reactos.org>

Confine to CONFIG_I82374. Add VMState.
Signed-off-by: NAndreas Färber <andreas.faerber@web.de>
Reviewed-by: NAlexander Graf <agraf@suse.de>