Describe the communication channel used to communicate with the
firmware which supports onlining and offlining of memory.
Keep the device in a disabled state for now until a conflict
between THP and memory-hotplug features can be resolved.
Change-Id: I3d74d9d3d58d379b2a91ee976a72dddfb7a221c6
Signed-off-by: Patrick Daly <quic_pdaly@quicinc.com>