[coreboot] flashrom: Can't mmap memory

[Myles Watson]

When I boot using the factory BIOS on my s2895 flashrom works.  When I
boot with Coreboot, I get the Error:

Can't mmap memory using /dev/mem: Operation not permitted

It shouldn't be kernel parameters since I'm using the same grub2 entry
to boot either way.

This sounds a little too familiar, but I can't find a thread where
this isn't linked to a newer, more restrictive kernel.

Thanks,
Myles