powerpc/powernv: Print the M64 range information in bootup log

The M64 range information is missed in dmesg, which would be helpful in debug.

This patch prints the M64 range information in the same format as M32.

Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com>
Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>