Fix for the "crash --log <dumpfile>" option on both of the PPC64
architectures.  Without the patch, the command fails with the message
"crash: seek error: physical address: <address> type: log_buf
pointer", followed by "crash: cannot read log_buf value".  This bug
was introduced in crash-7.0.0 by a patch that added support for the
PPC64 BOOK3E processor family.
(anderson@redhat.com)