Update flash_w25n.c

[somethingjustlike]

Add giantec nor flash id
GT25Q64EZ and GT25Q128EZ
thanks for your review
GT25Q128EZ H_DS V1.2.pdf
GT25Q64EZ H_DS V1.3.pdf

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Branch Targeting Suggestion

You've targeted the master branch with this PR. Please consider if a version branch might be more appropriate:

• maintenance-9.x - If your change is backward-compatible and won't create compatibility issues between INAV firmware and Configurator 9.x versions. This will allow your PR to be included in the next 9.x release.

• maintenance-10.x - If your change introduces compatibility requirements between firmware and configurator that would break 9.x compatibility. This is for PRs which will be included in INAV 10.x

If master is the correct target for this change, no action is needed.

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This is an automated suggestion to help route contributions to the appropriate branch.