Patch to partially boot an EFIKA

[Andrew Turner]

The attached patch helps me to partially boot my EFIKA. The file
ofwread.S is from NetBSD and needs to be placed in sys/powerpc/powerpc.

The patch takes the real-mode ofw interface code from NetBSD and the
TLB exception handlers from //depot/user/jaras in perforce.

The call to ofwr_init in locore.S is not enabled by default as
it doesn't currently work on my Apple. By commenting out the
FIRMWORKSBUGS ifdef, to call ofwr_init, I can get my EFIKA to boot until
it attempts to schedule work.

Andrew
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