imx9/flexcan: Add disable/enable cycle

[jlaitine]

Summary

This corrects the imx9 can bus driver in case of warm reboot, where the flexcan block might be already initialized

Impact

Impacts only imx9 canbus when doing warm reboot

Testing

Tested on a imx93 board

[nuttxpr]

[Experimental Bot, please feedback here]

Yes, this PR appears to meet the basic requirements, but it is lacking crucial details. While it addresses the summary and testing sections, it's far too brief and omits important information.

Here's why it's incomplete and how to improve it:

• Summary: While it states what is changed, it lacks the how and why. How does the fix correct the initialization issue? What was the root cause of the problem in the first place? A related NuttX issue should be linked if one exists.
• Impact: While it mentions the impact on the i.MX9 CAN bus, it lacks specificity. Does this fix a bug? Improve performance? Add a feature? The other impact categories are completely unanswered (build, hardware, documentation, security, compatibility). Even if the answer is "NO," it should be explicitly stated.
• Testing: "Tested on an i.MX93 board" is insufficient. Provide details:
  • Which i.MX93 board specifically?
  • Which NuttX configuration?
  • What tests were run?
  • Crucially: Include the requested "before" and "after" logs. These demonstrate that the change has the intended effect. Without these logs, the testing claim is unsubstantiated.

In short: The PR provides a starting point but needs significantly more detail to be considered complete. The missing information makes it difficult to review and assess the impact of the change.