mtd: rawnand: nand_base: Handle algorithm selection

For BRCMNAND with 1-bit BCH ECC (BCH-1) such as used on the
D-Link DIR-885L and DIR-890L routers, we need to explicitly
select the ECC like this in the device tree:

  nand-ecc-algo = "bch";
  nand-ecc-strength = <1>;
  nand-ecc-step-size = <512>;

This is handled by the Linux kernel but U-Boot core does
not respect this. Fix it up by parsing the algorithm and
preserve the behaviour using this property to select
software BCH as far as possible.

Reviewed-by: Michael Trimarchi <[email protected]>
Acked-by: William Zhang <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
Tested-by: Tom Rini <[email protected]> [am335x_evm]
Link: https://lore.kernel.org/all/[email protected]/
Signed-off-by: Dario Binacchi <[email protected]>

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