pci_ivshmem.c: ivshmem_support_irq API support

[CV-Bowen]

Summary

ivshmem based driver can use this api to judge weather current ivshmem device support irq or not, and use polling mode or irq mode to process the event.

Impact

ivshmem based drivers

Testing

qemu armv8a and rptun-ivshmem

[nuttxpr]

[Experimental Bot, please feedback here]

This PR appears incomplete based on the NuttX requirements.

Here's why:

• Summary:

  • Lacks details about the necessity of the change. Is it a fix, update, or new feature?
  • The description of the change's functionality is vague. Be more specific about what the API does and how it determines IRQ support.
  • Missing links to related NuttX issues or pull requests.

• Impact:

  • While it mentions "ivshmem based drivers," it doesn't explain how they are impacted. Will existing drivers need modification?
  • The impact sections (build, hardware, documentation, security, compatibility) are completely blank. Address each one with either "NO" or a "YES" followed by a clear explanation.

• Testing:

  • While it mentions the testing environments, it lacks the actual testing logs before and after the change. This is crucial to demonstrate the PR's functionality.

To improve this PR:

1. Expand the Summary: Clearly articulate the problem this PR solves or the feature it adds. Provide specific details about the API's functionality and link any related issues.
2. Complete the Impact Section: Address all impact categories (build, hardware, documentation, security, compatibility) with either "NO" or a "YES" + explanation.
3. Include Testing Logs: Paste the relevant logs from your testing both before and after implementing the changes.