purism/librem13v1: Disable PCI Express AER capability

The Librem 13v1 does not seem to have working AER and this option
was needed and tested on the Librem 13v1. Without it, the linux
console gets spammed with AER errrors.

Change-Id: I13d0afa085b426920d7a946e6209f924ce29ae52
Signed-off-by: Youness Alaoui <youness.alaoui@puri.sm>
Reviewed-on: https://review.coreboot.org/25327
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
1 file changed