[U-Boot] [PATCH RFC] NAND: Improve read performance from Large Page NAND devices

[Nick Thompson]

Improve read performance from Large Page NAND devices.

This patch produces a ~31% improvement in oob_first read speed (on a
300MHz ARM9). The time for a mid-buffer 2k page read is now 293us,
6.99MB/s (was 385us, 5.31MB/s). oob_first is probably the best case
improvement.

Signed-off-by: Nick Thompson <nick.thompson at ge.com>
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