[U-Boot] Proposal to add NAND-boot support for Sunxi SPL

[Roy Spliet]

The following patches take the work by Daniel Kochmánski, and make some
heavy modifications for readability and functionality, based on Boris
Brezillon's Linux driver. Tested on an Olimex Lime w/ A20.
Patches are sent as RFC. Open questions:
- Config options added are partially NAND-chip specific. Some options can
be autodetected based on the NAND ID, others require either brute-forcing
or config options like these. Do they belong in sunxi-common? Should
we make a Kconfig option for this? If bikeshedding is desired, are defines
in sunxi-common.h good enough for now?
- Style is mostly kernel-like. Satisfied?
- Daniel: do you think we can work from here?

Please comment away!

Roy


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