Merge tag 'mtd/qcom-reorg-for-spi-6.14' into nand/next

Topic branch with preparation changes from Qcom in order to apply on top
the spi bits adding the Qcom SPI-NAND controller driver re-using a lot
of code that has been shared.

With this goal in mind, the raw NAND controller driver has been cleaned
up and reorganized, and only the relevant structures/helpers which have
nothing raw NAND specific should now be exported.