Define a version of memory_block_size_bytes() for powerpc/pseries such that
a memory block spans an entire lmb.
Signed-off-by: NNathan Fontenot <nfont@austin.ibm.com>
Reviewed-by: NRobin Holt <holt@sgi.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>