NAND: Add nand read.raw and write.raw commands

NAND: Add nand read.raw and write.raw commands

These commands should work around various "hardware" ECC and BCH methods.

Signed-off-by: Marek Vasut <[email protected]>
Cc: Scott Wood <[email protected]>
Cc: Stefano Babic <[email protected]>
Cc: Wolfgang Denk <[email protected]>
Cc: Detlev Zundel <[email protected]>
[[email protected]: s/write the page/access the page/]
Signed-off-by: Scott Wood <[email protected]>