lsmem: display global memmap on memory parameter

lsmem: display global memmap on memory parameter

Display the output of global memmap-on-memory parameter for memory
hotplug. Retrieve the details via
/sys/module/memory_hotplug/parameters/memmap_on_memory.

lsmem
RANGE                                 SIZE  STATE REMOVABLE BLOCK
0x0000000000000000-0x00000001ffffffff   8G online       yes  0-63

Memory block size:                128M
Total online memory:                8G
Total offline memory:               0B
Memmap on memory parameter:        yes

Signed-off-by: Sumanth Korikkar <sumanthk@linux.ibm.com>