LibBSD | ARM64 MSI/ITS interrupt enable/disable latency (#71)

[geng zhu (@zhugengyu2023)]

geng zhu created an issue: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/issues/71



## Summary
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Hello all, I am working on merging freebsd-14 pcie driver to rtems-libbsd (6-freebsd-14, https://gitee.com/phytium_embedded/rtems-libbsd/blob/6-freebsd-14/freebsd/sys/dev/pci/pci_host_generic.c), basically for xhci and nvme support，my platform is aarch64，and MSI/MSIx supported by Gicv3 ITS.

My issue is that every MSI/ITS interrupt handling will experience disable/enable procdure, which is time consuming (not like SPI interrupt, ITS interrupt needs to send sync command and flush cache in every disable/enable process), I tried to ignore the disable/enable actions but not working (it seems like pci device interrupt ACK action in irqserver thread keeps preempted by interrupt)

P.S. My gicv3 and gicv3 its driver merge from zephyr and basiclly works in RTEMS now, except above issue

Does any one give me some idea, I'm trying on
1. disable interrupt nesting in rtems kerenl
2. ack pci interrupt in top-half

## Steps to reproduce


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View it on GitLab: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/issues/71
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