acpi: pcihp: allow repeating hot-unplug requests

Igor Mammedovrequested to merge
(removed):php_unplug_block_fix into c9s

Merge Request Required Information

Summary of Changes

Allow to send repeated unplug requests to PCI devices when ACPI PCI hotplug is in use.

Before fix: QEMU prevents user to send repeated unplug requests, and in the case unplug happens before guest Linux kernel boots, the later wipes out unplug event. So QEMU ends up in state where it is impossible to reissue lost unplug event for the device.

Approved Bugzilla Ticket

BZ: https://bugzilla.redhat.com/show_bug.cgi?id=2087047
Upstream status: merged

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