mtd: atmel_nand: runtime to build gf table for pmecc

As in SAMA5D4 SoC, the gf table in ROM code can not be seen.
So, when we try to use PMECC, we need to build it when do
initialization.
Add a macro NO_GALOIS_TABLE_IN_ROM in soc header file. If it
is defined we will build gf table runtime.

The PMECC use the BCH algorithm, so based on the build_gf_tables()
function in lib/bch.c, we can build the Galois Field lookup table.

Signed-off-by: Josh Wu <[email protected]>
Signed-off-by: Bo Shen <[email protected]>
Signed-off-by: Andreas Bießmann <[email protected]>

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