The NS2502 uses hardcoded partitions but parsing the RedBoot
FIS should work fine, given that this flash seems to be using
0x200000 erase blocks.

Cc: Corentin Labbe <clabbe.montjoie@gmail.com>
Link: https://lore.kernel.org/r/20220412220358.3674598-1-linus.walleij@linaro.orgSigned-off-by: Linus Walleij <linus.walleij@linaro.org>