add support for GIGADEVICE GD5FGQ4UB91G spi nand

[spyke-ninja]

Description

can you add the support for GD5FGQ4UB91G ? these family nand is supported in SNANDER

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[bigbigmdm]

@spyke-ninja, I have no plans to support NAND flash memory chips yet.

For now, I want to add support for the AT45DBxxx series.

Then I will try to add support for the CH347 high speed programmer.

After that, we can think about NAND flash as well. Only there is a big problem - I don't have these chips in my home. I don't even know where they are used.