atmel_nand: use nand ecc_{strength, step}_ds instead of our own function

Since ecc_{strength,step}_ds is introduced in nand_chip structure for
minimum ecc requirements. So we can use them directly and remove our
own get_onfi_ecc_param function.

Signed-off-by: Josh Wu <[email protected]>
Reviewed-by: Andreas Bießmann <[email protected]>
Signed-off-by: Wenyou Yang <[email protected]>

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