[coreboot] [RFC] Improve very early boot

[Kyösti Mälkki]

Hi

On selected boards, some hardware initialisation is placed in the
bootblock. The source files and directories are currently hard-coded in
Kconfigs, which is sort of ugly.

A few months ago I put together changeset [1], which hasn't drawn much
review or interest. One benefit of my changeset is that it can be
extended to move superio and console initialisation to bootblock. 
Serial-line IO can then be used to switch between fallback/normal
romstage and early POSTs could go to serial too.

Thanks for any comments.

KM

[1] http://review.coreboot.org/#/c/473/