[Patches from Fedora package] ieee1275: IBM Power changes

[Lubomir Rintel]

Hi,

chained to this message are fixes and enhancements from Fedora package (Red Hat 
Enterprise Linux ships them too) related to ieee1275-based IBM Power platform 
support. I've made only minor changes to them, described in individual commit 
messages.

I'd like to have them reviewed and eventually merged so that well be able to 
deal with divergence of our package from mainline. Linux distributions 
interested in good IBM Power support may find them useful too.

Thanks in advance for feedback!
Lubo