MT7621 ECC convert tool using guide

copy image to RT288x_SDK/tools/NAND_ECC_tool/MT7621
cd RT288x_SDK/tools/NAND_ECC_tool/MT7621


USAGE: ./BCH ENC|DEC PAGE_SIZE SPARE_SIZE input_file output_file
SPARE_SIZE 64/128/224
PAGE_SIZE 2048/4096

example: ./BCH e 2048 64 roger_image linux_4bitECC.bin

md5sum BCH
V1:
426e0d0457eda53ff8311fff046b6d64  BCH
V2:
c228cfcf63a39f261a7d38526bd18228  BCH

