[coreboot] commit 94f8699 bricks my Lenovo X230

[Iru Cai]

Hi,

The latest git code bricks my Lenovo X230. After a git bisect, I found the
bad commit is 9438699[1] and reverting will work. The log from USB debug
console says there's an exception after the ``erase MRC cache`` message.

Lenovo X230 has two flash chips. I don't know if it's related to this.

[1]: https://review.coreboot.org/#/c/17684/

Iru