flashchips: Add Spansion S25FL512S

As found on the Tesla AP2.5 board.

Based on https://mail.coreboot.org/pipermail/flashrom/2013-June/011066.html



Tested with:
    flashrom -p linux_spi:dev=/dev/spidev0.0,spispeed=512 -r content.bin

Signed-off-by: Bernhard Urban-Forster <lewurm@gmail.com>
Change-Id: Ifa9b7615951125b6bbc1f051370ef54896bf506c
Reviewed-on: https://review.coreboot.org/c/flashrom/+/38596


Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: David Hendricks <david.hendricks@gmail.com>