lowmemorykiller: Use asynchronous compaction

Change-Id: I6a65d06fc30b88fcedaaf1abf1855fdd19e3c912
drivers: staging: android: lmk compile fixup

Change-Id: I28aa6ca5c1eef697b1bad01676cddb08a48d46e0
Signed-off-by: Dennis Rassmann <showp1984@gmail.com>