Make some fs/nand related related error messages visible

Helped to debug a previously unknown nand chip.

Signed-off-by: Luc Verhaegen <libv@skynet.be>
allwinner libnand: add a handful of samsung nand id strings

These were taken from the equivalent kernel code. There are many more
available, but that's for another time. You know where to look.

Signed-off-by: Luc Verhaegen <libv@skynet.be>
boards: add a sduart version of sun5i

Signed-off-by: Luc Verhaegen <libv@skynet.be>
sun5i board config: fix up default boot commands

They should now be actually useful, and the howtos will be updated.

Also, it might be a good idea to add this to the sun4i config as well.

Signed-off-by: Luc Verhaegen <libv@skynet.be>