[coreboot] [PATCH][v3] Make OPTION_TABLE = n build, move to a menu option

[Corey Osgood]

It's incredibly annoying to have to reset the BIOS options after every
coreboot test run, so I've "fixed" the problem with errors when building
with OPTION_TABLE deselected, but I'm not exactly 100% sure it's the right
fix. I'd REALLY appreciate it if someone checks ;) Also, I've removed
"select OPTION_TABLE" from all the mainboard Kconfigs (the new option
defaults to y), but I'm not sure if there are any chipsets where the option
table is absolutely required.

Thanks,
Corey