contigmalloc won't allocate more than one page

[Justin Hibbits]

I've been spending the day trying to get ofwdump to work correctly on
ppc64, and found that for at least one property it needs a full page for
the property value.  So, to fix this I checked the maximum ioctl sizes, and
with a buffer it totals 5 pages, so I tried to get ofw_real_bounce_alloc()
to allocate 5 pages instead of one.  WIth this, it hangs when allocating
the memory for the buffer.  So, I tried just two pages, and got the same
result.

After this failure, I tried creating a static array of 8192 bytes, and it
doesn't even get to the black screen now.

Obviously, the better way to go would be to allocate it, but I don't have
enough understanding of the VM system and the OEA64 VM code to fix this bug.

- Justin