Add GD55 QSPI NOR Flash support

[TimJTi]

Summary

This adds support for the GigaDevice QSPI GD55 NOR Flash devices

Impact

None, other than adding new device support

Testing

On a custom board using SAMA5D27C-D1G with a single GD55B01G 1Gbit device. Device has been partioned, fully and partially erased, written to and protected in various ways and checked that the protected areas report as locked correctly. Some performance measruerments taken and it behaves well.

Support has been added for the 2Gbit device "in good faith" but I have no board with this device to hand to check it.

[nuttxpr]

[Experimental Bot, please feedback here]

Fill In The Commit Message: This PR contains a Commit with an Empty Commit Message. Please fill in the Commit Message with the PR Summary.

The PR, as described, partially meets the NuttX requirements. While it provides a summary and some testing information, it lacks crucial details.

Here's what's missing:

• Summary: While the "what" is stated (adding GD55 support), the "why" and "how" are absent. Why is this support needed? What code changes were implemented to add this support (driver changes, board configuration updates, etc.)? Linking a related NuttX issue would greatly strengthen this section.
• Impact: While stating "None, other than adding new device support" is a start, it's too broad. Be explicit. Does this impact any existing QSPI drivers? Are there any configuration options users need to be aware of? Even if the answer is truly no impact beyond the new device, explicitly stating "No impact on existing QSPI drivers" is better. Also, consider the documentation impact. Does this require documentation updates?
• Testing: "On a custom board" is insufficient. Provide specifics:
  • Host OS and toolchain version used for building.
  • NuttX configuration used on the SAMA5D27C-D1G (e.g., sama5d27c_som1_ek_defconfig).
  • Clear "before" and "after" logs demonstrating the functionality. Ideally, the "before" logs should show the lack of GD55 support (e.g., failure to detect the device), and the "after" logs should show successful detection and basic operation (e.g., reading/writing to the flash).

In short, the PR needs more detail to meet the NuttX requirements fully. Providing more context and specifics will greatly improve the review process and increase the likelihood of acceptance.

[xiaoxiang781216]

@TimJTi does it ready for review?

[TimJTi]

@TimJTi does it ready for review?

@xiaoxiang781216 - just doing some final checks and adjustments as I found a few minor inconsistencies. Should be marking it as ready later today