From: Anton Blanchard <anton@samba.org>

Gone are the days of initialising stuff we touch in prom_init just
to keep it out of the BSS. There are a few things the hypervisor
writes to in the iseries case, hard code them into the data segment
and add a comment.

Remove the -fno-zero-initialized-in-bss hack, it was required when
gcc got smart and put zero initialised stuff into the BSS