hw/scsi/lsi53c895a: bump instruction limit in scripts processing to fix regression

hw/scsi/lsi53c895a: bump instruction limit in scripts processing to fix regression

Commit 9876359990 ("hw/scsi/lsi53c895a: add timer to scripts
processing") reduced the maximum allowed instruction count by
a factor of 100 all the way down to 100.

This causes the "Check Point R81.20 Gaia" appliance [0] to fail to
boot after fully finishing the installation via the appliance's web
interface (there is already one reboot before that).

With a limit of 150, the appliance still fails to boot, while with a
limit of 200, it works. Bump to 500 to fix the regression and be on
the safe side.

Originally reported in the Proxmox community forum[1].

[0]: https://support.checkpoint.com/results/download/124397
[1]: https://forum.proxmox.com/threads/149772/post-683459

Cc: qemu-stable@nongnu.org
Fixes: 9876359990 ("hw/scsi/lsi53c895a: add timer to scripts processing")
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
Acked-by: Sven Schnelle <svens@stackframe.org>
Link: https://lore.kernel.org/r/20240715131403.223239-1-f.ebner@proxmox.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit a4975023fb13cf229bd59c9ceec1b8cbdc5b9a20)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>