[U-Boot] [v3 (RFC)] Proposal to add NAND-boot support for Sunxi SPL

[Roy Spliet]

Hereby a v3 of the patches adding NAND support to SPL. Most noticably 
all the feedback has been addressed: tidy structs for NAND and DMA, 
timeouts on wait operations and more proper use of the CCU.
Patches are marked RFC mostly because I'm still contemplating the
implementation of a proper full NAND driver to be used with the existing
UBI subsystem. This could mean some slight changes in structure to better
accomodate code sharing between sunxi-nand for SPL and U-boot.
If you wish you can merge the first three patches though, I expect them
not to change any further.
Thanks for earlier feedback, and don't hesitate to let me know if anything
else could be improved.
Cheers,

Roy


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