[coreboot] [PATCH 3/6 V2] Geode GX2 cleanup patch

[Nils]

Use die()  to assure the processor can't wake up from an interrupt.

Signed-off-by: Nils Jacobs

This was suggested by Peter and Stefan. Thanks!
I also included the same patch for Geode LX and added a second die()
to Geode GX2 at the same place as in the LX code.

I boot tested it on my Wyse S50 and it seems to work.

Thanks, Nils.