powerpc/xmon: Dump memory in CPU endian format

powerpc/xmon: Dump memory in CPU endian format

BugLink: http://bugs.launchpad.net/bugs/1691973
Extend the dump command to allow display of 2, 4, and 8 byte words in
CPU endian format. Also adds dump command for "1 byte values" for the
sake of symmetry. New commands are:

  d1	dump 1 byte values
  d2	dump 2 byte values
  d4	dump 4 byte values
  d8	dump 8 byte values

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Douglas Miller <dougmill@linux.vnet.ibm.com>
Acked-by: Balbir Singh <bsingharora@gmail.com>
(cherry picked from commit 5e48dc0aa4d9daf93e9bff2a274473623a134ec8)
Signed-off-by: Gustavo Walbon <gwalbon@linux.vnet.ibm.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>