patch: powerbutton and com2 for lx

[ron minnich]

This is tested and working on DBE62.

powerbutton is now in stage2, controlled by dts.

ron

[Stefan Reinauer]

* ron minnich  [080306 02:51]:
> This is tested and working on DBE62.
>
> powerbutton is now in stage2, controlled by dts.
>
> ron
> This fix moves the power button management to stage 2. Power button is 
> now default disabled, which is the safest setting. Power button is 
> controlled by the power_button in the cs5536 dts. "1" means enable.
>
> This patch also adds (we hope temporarily!) a function in stage1 to 
> setup COM2 as COM1. We're working around this but for now it's needed. 
> This function is from v2.
>
> Signed-off-by: Ronald G. Minnich

Acked-by: Stefan Reinauer
> http://www.coreboot.org/mailman/listinfo/coreboot