[coreboot] Accidentally broken builds with kconfig

[Myles Watson]

[11/115] amd/serengeti_cheetah_fam10 fail.
[34/115] digitallogic/adl855pc fail.
[38/115] emulation/qemu-x86 fail.
[49/115] intel/eagleheights fail.
[68/115] msi/ms7135 fail.
[70/115] msi/ms9185 fail.
[77/115] pcengines/alix1c fail.
[83/115] supermicro/h8dmr_fam10 fail.
[85/115] supermicro/x6dhe_g fail.
[86/115] supermicro/x6dhe_g2 fail.
[91/115] technologic/ts5300 fail.
[98/115] tyan/s2880 fail.
[100/115] tyan/s2882 fail.
[106/115] tyan/s2912_fam10 fail.
[111/115] via/epia-m700 fail.
[115/115] via/vt8454c fail.

I admit that some of these are my fault.  I think it's time to add kbuildall
to qa.coreboot.org.  If we could track the number of warnings for each build
that would be helpful to.

Thanks,
Myles