scsi-disk: add new quirks bitmap to SCSIDiskState

scsi-disk: add new quirks bitmap to SCSIDiskState

Since the MacOS SCSI implementation is quite old (and Apple added some firmware
customisations to their drives for m68k Macs) there is need to add a mechanism
to correctly handle Apple-specific quirks.

Add a new quirks bitmap to SCSIDiskState that can be used to enable these
features as required.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20220622105314.802852-2-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>