flashchips: Add Winbond W25P80/16/32 support

This adds support for W25P80/16/32 chips. Most notably these chips only
have two erase commands - one for 64KiB "sectors" and one for chip
erase.

Change-Id: Ie09ba8e28fee35c42e17ca05219dc673413de93b
Signed-off-by: David Hendricks <david.hendricks@gmail.com>
Reviewed-on: https://review.coreboot.org/23700
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
2 files changed