this simplifies the microcode pull-in

We already have a config for a more free version using SeaVGABIOS. From now
on we build, test and release that too. The image filename should just
contail _free_ which is probably enough.

Closes #32

It feelds a little more streamlined when not repeating everything the
user does.

We rebased commit ([WIP] 3rdparty/blobs: Bump for new microcode update for
Intel model 306ax) to the current coreboot master state fb758d420b and
update our build scripts.

We run oldconfig on our config and update it.

We've had a double-quote issue there

also, we use the check for x230 in the flashing scripts now. They have
to be run as root now.

This is included upstream.

We have to do this for the release, see #34

seabios has tagged a release and it's up at coreboot for review in be
included. We'll definitely have it in our next release.