[PATCH] ppc32: Dump error status for both PLB segments on 440SP

The PowerPC 440SP SoC has two Processor Local Bus (PLB) segments (a
high-throughput segment and a low-latency segment).  Fix our PLB register
definitions to cope with this, and add code to dump the status of both
segments when a machine check occurs.

Signed-off-by: Roland Dreier <rolandd@cisco.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>